to do ones best

from The Collaborative International Dictionary of English v.0.48
do \do\ (d[=oo]), v. t. or auxiliary. [imp. {did} (d[i^]d); p.
   p. {done} (d[u^]n); p. pr. & vb. n. {Doing} (d[=oo]"[i^]ng).
   This verb, when transitive, is formed in the indicative,
   present tense, thus: I do, thou doest (d[=oo]"[e^]st) or dost
   (d[u^]st), he does (d[u^]z), doeth (d[=oo]"[e^]th), or doth
   (d[u^]th); when auxiliary, the second person is, thou dost.
   As an independent verb, dost is obsolete or rare, except in
   poetry. "What dost thou in this world?" --Milton. The form
   doeth is a verb unlimited, doth, formerly so used, now being
   the auxiliary form. The second pers, sing., imperfect tense,
   is didst (d[i^]dst), formerly didest (d[i^]d"[e^]st).] [AS.
   d[=o]n; akin to D. doen, OS. duan, OHG. tuon, G. thun, Lith.
   deti, OSlav. d[=e]ti, OIr. d['e]nim I do, Gr. tiqe`nai to
   put, Skr. dh[=a], and to E. suffix -dom, and prob. to L.
   facere to do, E. fact, and perh. to L. -dere in some
   compounds, as addere to add, credere to trust. [root]65. Cf.
   {Deed}, {Deem}, {Doom}, {Fact}, {Creed}, {Theme}.]
   1. To place; to put. [Obs.] --Tale of a Usurer (about 1330).
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   2. To cause; to make; -- with an infinitive. [Obs.]
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            My lord Abbot of Westminster did do shewe to me late
            certain evidences.                    --W. Caxton.
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            I shall . . . your cloister do make.  --Piers
                                                  Plowman.
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            A fatal plague which many did to die. --Spenser.
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            We do you to wit [i. e., We make you to know] of the
            grace of God bestowed on the churches of Macedonia.
                                                  --2 Cor. viii.
                                                  1.

   Note: We have lost the idiom shown by the citations (do used
         like the French faire or laisser), in which the verb in
         the infinitive apparently, but not really, has a
         passive signification, i. e., cause . . . to be made.
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   3. To bring about; to produce, as an effect or result; to
      effect; to achieve.
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            The neglecting it may do much danger. --Shak.
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            He waved indifferently 'twixt doing them neither
            good not harm.                        --Shak.
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   4. To perform, as an action; to execute; to transact to carry
      out in action; as, to do a good or a bad act; do our duty;
      to do what I can.
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            Six days shalt thou labor and do all thy work. --Ex.
                                                  xx. 9.
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            We did not do these things.           --Ld. Lytton.
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            You can not do wrong without suffering wrong.
                                                  --Emerson.
      Hence: To do homage, honor, favor, justice, etc., to
      render homage, honor, etc.
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   5. To bring to an end by action; to perform completely; to
      finish; to accomplish; -- a sense conveyed by the
      construction, which is that of the past participle done.
      "Ere summer half be done." "I have done weeping." --Shak.
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   6. To make ready for an object, purpose, or use, as food by
      cooking; to cook completely or sufficiently; as, the meat
      is done on one side only.
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   7. To put or bring into a form, state, or condition,
      especially in the phrases, to do death, to put to death;
      to slay; to do away (often do away with), to put away; to
      remove; to do on, to put on; to don; to do off, to take
      off, as dress; to doff; to do into, to put into the form
      of; to translate or transform into, as a text.
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            Done to death by slanderous tongues.  -- Shak.
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            The ground of the difficulty is done away. -- Paley.
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            Suspicions regarding his loyalty were entirely done
            away.                                 --Thackeray.
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            To do on our own harness, that we may not; but we
            must do on the armor of God.          -- Latimer.
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            Then Jason rose and did on him a fair
            Blue woolen tunic.                    -- W. Morris
                                                  (Jason).
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            Though the former legal pollution be now done off,
            yet there is a spiritual contagion in idolatry as
            much to be shunned.                   --Milton.
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            It ["Pilgrim's Progress"] has been done into verse:
            it has been done into modern English. -- Macaulay.
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   8. To cheat; to gull; to overreach. [Colloq.]
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            He was not be done, at his time of life, by
            frivolous offers of a compromise that might have
            secured him seventy-five per cent.    -- De Quincey.
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   9. To see or inspect; to explore; as, to do all the points of
      interest. [Colloq.]
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   10. (Stock Exchange) To cash or to advance money for, as a
       bill or note.
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   11. To perform work upon, about, for, or at, by way of caring
       for, looking after, preparing, cleaning, keeping in
       order, or the like.

             The sergeants seem to do themselves pretty well.
                                                  --Harper's
                                                  Mag.
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   12. To deal with for good and all; to finish up; to undo; to
       ruin; to do for. [Colloq. or Slang]

             Sometimes they lie in wait in these dark streets,
             and fracture his skull, . . . or break his arm, or
             cut the sinew of his wrist; and that they call
             doing him.                           --Charles
                                                  Reade.
       [Webster 1913 Suppl.]

   Note:
       (a) Do and did are much employed as auxiliaries, the verb
           to which they are joined being an infinitive. As an
           auxiliary the verb do has no participle. "I do set my
           bow in the cloud." --Gen. ix. 13. [Now archaic or
           rare except for emphatic assertion.]
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                 Rarely . . . did the wrongs of individuals to
                 the knowledge of the public.     -- Macaulay.
       (b) They are often used in emphatic construction. "You
           don't say so, Mr. Jobson. -- but I do say so." --Sir
           W. Scott. "I did love him, but scorn him now."
           --Latham.
       (c) In negative and interrogative constructions, do and
           did are in common use. I do not wish to see them;
           what do you think? Did C[ae]sar cross the Tiber? He
           did not. "Do you love me?" --Shak.
       (d) Do, as an auxiliary, is supposed to have been first
           used before imperatives. It expresses entreaty or
           earnest request; as, do help me. In the imperative
           mood, but not in the indicative, it may be used with
           the verb to be; as, do be quiet. Do, did, and done
           often stand as a general substitute or representative
           verb, and thus save the repetition of the principal
           verb. "To live and die is all we have to do."
           --Denham. In the case of do and did as auxiliaries,
           the sense may be completed by the infinitive (without
           to) of the verb represented. "When beauty lived and
           died as flowers do now." --Shak. "I . . . chose my
           wife as she did her wedding gown." --Goldsmith.
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                 My brightest hopes giving dark fears a being.
                 As the light does the shadow.    -- Longfellow.
           In unemphatic affirmative sentences do is, for the
           most part, archaic or poetical; as, "This just
           reproach their virtue does excite." --Dryden.
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   {To do one's best}, {To do one's diligence} (and the like),
      to exert one's self; to put forth one's best or most or
      most diligent efforts. "We will . . . do our best to gain
      their assent." --Jowett (Thucyd.).

   {To do one's business}, to ruin one. [Colloq.] --Wycherley.

   {To do one shame}, to cause one shame. [Obs.]

   {To do over}.
       (a) To make over; to perform a second time.
       (b) To cover; to spread; to smear. "Boats . . . sewed
           together and done over with a kind of slimy stuff
           like rosin." --De Foe.

   {To do to death}, to put to death. (See 7.) [Obs.]

   {To do up}.
       (a) To put up; to raise. [Obs.] --Chaucer.
       (b) To pack together and envelop; to pack up.
       (c) To accomplish thoroughly. [Colloq.]
       (d) To starch and iron. "A rich gown of velvet, and a
           ruff done up with the famous yellow starch."
           --Hawthorne.

   {To do way}, to put away; to lay aside. [Obs.] --Chaucer.

   {To do with}, to dispose of; to make use of; to employ; --
      usually preceded by what. "Men are many times brought to
      that extremity, that were it not for God they would not
      know what to do with themselves." --Tillotson.

   {To have to do with}, to have concern, business or
      intercourse with; to deal with. When preceded by what, the
      notion is usually implied that the affair does not concern
      the person denoted by the subject of have. "Philology has
      to do with language in its fullest sense." --Earle. "What
      have I to do with you, ye sons of Zeruiah?" --2 Sam. xvi.
      10.
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