The Collaborative International Dictionary of English v.0.48:

Checkmate \Check"mate\ (-m[=a]t), v. t. [imp. & p. p.
   Checkmated; p. pr. & vb. n. Checkmating.]
   1. (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 is no escape.
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   2. To defeat completely; to terminate; to thwart.
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            To checkmate and control my just demands. --Ford.
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