American English

Definition of checkmate noun from the Oxford Advanced American Dictionary



    (also mate) [uncountable]
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  1. 1(in chess) a position in which one player cannot prevent his or her king (= the most important piece) being captured and therefore loses the game see also check compare stalemate
  2. 2a situation in which someone has been completely defeated
checkmate verb checkmate somebody/something
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His king had been checkmated. She hoped the plan would checkmate her opponents.