The Collaborative International Dictionary of English v.0.48:

Score \Score\ (sk[=o]r), n. [AS. scor twenty, fr. sceran,
   scieran, to shear, cut, divide; or rather the kindred Icel.
   skor incision, twenty, akin to Dan. skure a notch, Sw.
   sk[*a]ra. See Shear.]
   1. A notch or incision; especially, one that is made as a
      tally mark; hence, a mark, or line, made for the purpose
      of account.
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            Whereas, before, our forefathers had no other books
            but the score and the tally, thou hast caused
            printing to be used.                  --Shak.
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   2. An account or reckoning; account of dues; bill; hence,
      indebtedness.
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            He parted well, and paid his score.   --Shak.
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   3. Account; reason; motive; sake; behalf.
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            But left the trade, as many more
            Have lately done on the same score.   --Hudibras.
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            You act your kindness in Cydaria's score. --Dryden.
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   4. The number twenty, as being marked off by a special score
      or tally; hence, in pl., a large number.
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            Amongst three or four score hogsheads. --Shak.
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            At length the queen took upon herself to grant
            patents of monopoly by scores.        --Macaulay.
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   5. A distance of twenty yards; -- a term used in ancient
      archery and gunnery. --Halliwell.
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   6. A weight of twenty pounds. [Prov. Eng.]
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   7. The number of points gained by the contestants, or either
      of them, in any game, as in cards or cricket.
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   8. A line drawn; a groove or furrow.
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   9. (Mus.) The original and entire draught, or its transcript,
      of a composition, with the parts for all the different
      instruments or voices written on staves one above another,
      so that they can be read at a glance; -- so called from
      the bar, which, in its early use, was drawn through all
      the parts. --Moore (Encyc. of Music).
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   10. the grade received on an examination, such as those given
       in school or as a qualifying examination for a job or
       admission to school; -- it may be expressed as a
       percentage of answers which are correct, or as a number
       or letter; as, a score of 98 in a civil service exam.
       [PJC]

   In score (Mus.), having all the parts arranged and placed
      in juxtaposition. --Smart.

   To quit scores, to settle or balance accounts; to render an
      equivalent; to make compensation.
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            Does not the earth quit scores with all the elements
            in the noble fruits that issue from it? --South.
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The Collaborative International Dictionary of English v.0.48:

Quit \Quit\, v. t. [imp. & p. p. Quit or Quitted; p. pr. &
   vb. n. Quitting.] [OE. quiten, OF. quiter, quitier,
   cuitier, F. quitter, to acquit, quit, LL. quietare, fr. L.
   quietare to calm, to quiet, fr. quietus quiet. See Quiet,
   a., and cf. Quit, a., Quite, Acquit, Requite.]
   1. To set at rest; to free, as from anything harmful or
      oppressive; to relieve; to clear; to liberate. [R.]
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            To quit you of this fear, you have already looked
            Death in the face; what have you found so terrible
            in it?                                --Wake.
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   2. To release from obligation, accusation, penalty, or the
      like; to absolve; to acquit.
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            There may no gold them quyte.         --Chaucer.
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            God will relent, and quit thee all his debt.
                                                  --Milton.
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   3. To discharge, as an obligation or duty; to meet and
      satisfy, as a claim or debt; to make payment for or of; to
      requite; to repay.
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            The blissful martyr quyte you your meed. --Chaucer.
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            Enkindle all the sparks of nature
            To quit this horrid act.              --Shak.
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            Before that judge that quits each soul his hire.
                                                  --Fairfax.
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   4. To meet the claims upon, or expectations entertained of;
      to conduct; to acquit; -- used reflexively.
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            Be strong, and quit yourselves like men. --1 Sam.
                                                  iv. 9.
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            Samson hath quit himself
            Like Samson.                          --Milton.
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   5. To carry through; to go through to the end. [Obs.]
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            Never worthy prince a day did quit
            With greater hazard and with more renown. --Daniel.
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   6. To have done with; to cease from; to stop; hence, to
      depart from; to leave; to forsake; as, to quit work; to
      quit the place; to quit jesting.
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            Such a superficial way of examining is to quit truth
            for appearance.                       --Locke.
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   To quit cost, to pay; to reimburse.

   To quit scores, to make even; to clear mutually from
      demands.
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            Does not the earth quit scores with all the elements
            in the noble fruits that issue from it? --South.
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   Syn: To leave; relinquish; resign; abandon; forsake;
        surrender; discharge; requite.

   Usage: Quit, Leave. Leave is a general term, signifying
          merely an act of departure; quit implies a going
          without intention of return, a final and absolute
          abandonment.
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