The Collaborative International Dictionary of English v.0.48:

Revoke \Re*voke"\, v. i. (Card Playing)
   To fail to follow suit when holding a card of the suit led,
   in violation of the rule of the game; to renege. --Hoyle.
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The Collaborative International Dictionary of English v.0.48:

Revoke \Re*voke"\, v. t. [imp. & p. p. Revoked;p. pr. & vb. n.
   Revoking.] [F. r['e]voquer, L. revocare; pref. re- re- +
   vocare to call, fr. vox, vocis, voice. See Voice, and cf.
   Revocate.]
   1. To call or bring back; to recall. [Obs.]
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            The faint sprite he did revoke again,
            To her frail mansion of morality.     --Spenser.
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   2. Hence, to annul, by recalling or taking back; to repeal;
      to rescind; to cancel; to reverse, as anything granted by
      a special act; as,, to revoke a will, a license, a grant,
      a permission, a law, or the like. --Shak.
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   3. To hold back; to repress; to restrain. [Obs.]
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            [She] still strove their sudden rages to revoke.
                                                  --Spenser.
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   4. To draw back; to withdraw. [Obs.] --Spenser.
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   5. To call back to mind; to recollect. [Obs.]
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            A man, by revoking and recollecting within himself
            former passages, will be still apt to inculcate
            these sad memoris to his conscience.  --South.
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   Syn: To abolish; recall; repeal; rescind; countermand; annul;
        abrogate; cancel; reverse. See Abolish.
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The Collaborative International Dictionary of English v.0.48:

Revoke \Re*voke"\, n. (Card Playing)
   The act of revoking.
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         She [Sarah Battle] never made a revoke.  --Lamb.
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WordNet (r) 3.0 (2006):

revoke
    n 1: the mistake of not following suit when able to do so [syn:
         revoke, renege]
    v 1: fail to follow suit when able and required to do so
    2: cancel officially; "He revoked the ban on smoking"; "lift an
       embargo"; "vacate a death sentence" [syn: revoke, annul,
       lift, countermand, reverse, repeal, overturn,
       rescind, vacate]