To lose ones mind

from The Collaborative International Dictionary of English v.0.48
Mind \Mind\ (m[imac]nd), n. [AS. mynd, gemynd; akin to OHG.
   minna memory, love, G. minne love, Dan. minde mind, memory,
   remembrance, consent, vote, Sw. minne memory, Icel. minni,
   Goth. gamunds, L. mens, mentis, mind, Gr. me`nos, Skr. manas
   mind, man to think. [root]104, 278. Cf. {Comment}, {Man},
   {Mean}, v., 3d {Mental}, {Mignonette}, {Minion}, {Mnemonic},
   {Money}.]
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   1. The intellectual or rational faculty in man; the
      understanding; the intellect; the power that conceives,
      judges, or reasons; also, the entire spiritual nature; the
      soul; -- often in distinction from the {body}.
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            By the mind of man we understand that in him which
            thinks, remembers, reasons, wills.    --Reid.
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            What we mean by mind is simply that which perceives,
            thinks, feels, wills, and desires.    --Sir W.
                                                  Hamilton.
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            Let every man be fully persuaded in his own mind.
                                                  --Rom. xiv. 5.
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            The mind shall banquet, though the body pine.
                                                  --Shak.
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   2. The state, at any given time, of the faculties of
      thinking, willing, choosing, and the like; psychical
      activity or state; as:
      (a) Opinion; judgment; belief.
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                A fool uttereth all his mind.     --Prov. xxix.
                                                  11.
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                Being so hard to me that brought your mind, I
                fear she'll prove as hard to you in telling her
                mind.                             --Shak.
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      (b) Choice; inclination; liking; intent; will.
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                If it be your minds, then let none go forth. --2
                                                  Kings ix. 15.
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      (c) Courage; spirit. --Chapman.
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   3. Memory; remembrance; recollection; as, to have or keep in
      mind, to call to mind, to put in mind, etc.
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   {To have a mind} or {To have a great mind}, to be inclined or
      strongly inclined in purpose; -- used with an infinitive.
      "Sir Roger de Coverly . . . told me that he had a great
      mind to see the new tragedy with me." --Addison.

   {To lose one's mind}, to become insane, or imbecile.

   {To make up one's mind}, to come to an opinion or decision;
      to determine.

   {To put in mind}, to remind. "Regard us simply as putting you
      in mind of what you already know to be good policy."
      --Jowett (Thucyd. ).
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