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Wiktionary Word definitions in Wiktionary
1 (context chess English) Having a king in check with no possible move to escape check, thus losing the game. 2 (context figuratively English) Suffering a personal loss with no obvious chance to escape the loss. v (en-past of: checkmate )

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Checkmate \Check"mate\ (-m[=a]t), v. t. [imp. & p. p. Checkmated ; p. pr. & vb. n. Checkmating .] (Chess) To check (an adversary's king) in such a manner that escape in impossible; to defeat (an adversary) by putting his king in check from which there ...