to let loose

from The Collaborative International Dictionary of English v.0.48
Let \Let\, v. t. [imp. & p. p. {Let} ({Letted} (l[e^]t"t[e^]d),
   [Obs].); p. pr. & vb. n. {Letting}.] [OE. leten, l[ae]ten
   (past tense lat, let, p. p. laten, leten, lete), AS.
   l[=ae]tan (past tense l[=e]t, p. p. l[=ae]ten); akin to
   OFries. l[=e]ta, OS. l[=a]tan, D. laten, G. lassen, OHG.
   l[=a]zzan, Icel. l[=a]ta, Sw. l[*a]ta, Dan. lade, Goth.
   l[=e]tan, and L. lassus weary. The original meaning seems to
   have been, to let loose, let go, let drop. Cf. {Alas},
   {Late}, {Lassitude}, {Let} to hinder.]
   1. To leave; to relinquish; to abandon. [Obs. or Archaic,
      except when followed by alone or be.]
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            He . . . prayed him his voyage for to let.
                                                  --Chaucer.
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            Yet neither spins nor cards, ne cares nor frets,
            But to her mother Nature all her care she lets.
                                                  --Spenser.
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            Let me alone in choosing of my wife.  --Chaucer.
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   2. To consider; to think; to esteem. [Obs.] --Chaucer.
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   3. To cause; to make; -- used with the infinitive in the
      active form but in the passive sense; as, let make, i. e.,
      cause to be made; let bring, i. e., cause to be brought.
      [Obs.]
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            This irous, cursed wretch
            Let this knight's son anon before him fetch.
                                                  --Chaucer.
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            He . . . thus let do slay hem all three. --Chaucer.
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            Anon he let two coffers make.         --Gower.
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   4. To permit; to allow; to suffer; -- either affirmatively,
      by positive act, or negatively, by neglecting to restrain
      or prevent.
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   Note: In this sense, when followed by an infinitive, the
         latter is commonly without the sign to; as to let us
         walk, i. e., to permit or suffer us to walk. Sometimes
         there is entire omission of the verb; as, to let [to be
         or to go] loose.
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               Pharaoh said, I will let you go.   --Ex. viii.
                                                  28.
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               If your name be Horatio, as I am let to know it
               is.                                --Shak.
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   5. To allow to be used or occupied for a compensation; to
      lease; to rent; to hire out; -- often with out; as, to let
      a farm; to let a house; to let out horses.
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   6. To give, grant, or assign, as a work, privilege, or
      contract; -- often with out; as, to let the building of a
      bridge; to let out the lathing and the plastering.
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   Note: The active form of the infinitive of let, as of many
         other English verbs, is often used in a passive sense;
         as, a house to let (i. e., for letting, or to be let).
         This form of expression conforms to the use of the
         Anglo-Saxon gerund with to (dative infinitive) which
         was commonly so employed. See {Gerund}, 2. " Your
         elegant house in Harley Street is to let." --Thackeray.
         In the imperative mood, before the first person plural,
         let has a hortative force. " Rise up, let us go."
         --Mark xiv. 42. " Let us seek out some desolate shade."
         --Shak.
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   {To let alone}, to leave; to withdraw from; to refrain from
      interfering with.

   {To let blood}, to cause blood to flow; to bleed.

   {To let down}.
      (a) To lower.
      (b) To soften in tempering; as, to let down tools,
          cutlery, and the like.

   {To let fly} or {To let drive}, to discharge with violence,
      as a blow, an arrow, or stone. See under {Drive}, and
      {Fly}.

   {To let in} or {To let into}.
      (a) To permit or suffer to enter; to admit.
      (b) To insert, or imbed, as a piece of wood, in a recess
          formed in a surface for the purpose.

   {To let loose}, to remove restraint from; to permit to wander
      at large.

   {To let off}.
      (a) To discharge; to let fly, as an arrow; to fire the
          charge of, as a gun.
      (b) To release, as from an engagement or obligation.
          [Colloq.]

   {To let out}.
      (a) To allow to go forth; as, to let out a prisoner.
      (b) To extend or loosen, as the folds of a garment; to
          enlarge; to suffer to run out, as a cord.
      (c) To lease; to give out for performance by contract, as
          a job.
      (d) To divulge.

   {To let slide}, to let go; to cease to care for. [Colloq.] "
      Let the world slide." --Shak.
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from The Collaborative International Dictionary of English v.0.48
Loose \Loose\ (l[=oo]s), a. [Compar. {Looser} (l[=oo]s"[~e]r);
   superl. {Loosest}.] [OE. loos, lous, laus, Icel. lauss; akin
   to OD. loos, D. los, AS. le['a]s false, deceitful, G. los,
   loose, Dan. & Sw. l["o]s, Goth. laus, and E. lose. [root]127.
   See {Lose}, and cf. {Leasing} falsehood.]
   1. Unbound; untied; unsewed; not attached, fastened, fixed,
      or confined; as, the loose sheets of a book.
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            Her hair, nor loose, nor tied in formal plat.
                                                  --Shak.
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   2. Free from constraint or obligation; not bound by duty,
      habit, etc.; -- with from or of.
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            Now I stand
            Loose of my vow; but who knows Cato's thoughts ?
                                                  --Addison.
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   3. Not tight or close; as, a loose garment.
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   4. Not dense, close, compact, or crowded; as, a cloth of
      loose texture.
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            With horse and chariots ranked in loose array.
                                                  --Milton.
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   5. Not precise or exact; vague; indeterminate; as, a loose
      style, or way of reasoning.
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            The comparison employed . . . must be considered
            rather as a loose analogy than as an exact
            scientific explanation.               --Whewel.
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   6. Not strict in matters of morality; not rigid according to
      some standard of right.
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            The loose morality which he had learned. --Sir W.
                                                  Scott.
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   7. Unconnected; rambling.
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            Vario spends whole mornings in running over loose
            and unconnected pages.                --I. Watts.
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   8. Lax; not costive; having lax bowels. --Locke.
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   9. Dissolute; unchaste; as, a loose man or woman.
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            Loose ladies in delight.              --Spenser.
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   10. Containing or consisting of obscene or unchaste language;
       as, a loose epistle. --Dryden.
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   {At loose ends}, not in order; in confusion; carelessly
      managed.

   {Fast and loose}. See under {Fast}.

   {To break loose}. See under {Break}.

   {Loose pulley}. (Mach.) See {Fast and loose pulleys}, under
      {Fast}.

   {To let loose}, to free from restraint or confinement; to set
      at liberty.
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