Webster's English Dictionary

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revoke

1. re.voke \ri-'vo-k\ vb [ME revoken, fr. MF revoquer, fr. L revocare, fr. 
   re- +] vocare to call - more at VOICE 1: to bring or call back  2: to annul 
   by recalling or taking back : RESCIND {~ a wil l} : to fail to follow suit 
   when able in a card game in violation of the rul es - re.vok.er n
2. revoke n : an act or instance of revoking in a card game