Verb

1. To cancel or invalidate by withdrawing or reversing

   Your driver's license will be revoked.

2. To fail to follow suit in a game of cards

Noun

1. The act of revoking in a game of cards.
2. A renege; a violation of important rules regarding the play of tricks in trick-taking card games serious enough to render the round invalid.
3. A violation ranked in seriousness somewhat below overt cheating, with the status of a more minor offense only because, when it happens, it is usually accidental.