Checkmate

Part of speech: noun (n.)

1. The position in the game of chess when a king is in check and cannot be released, -- which ends the game.

2. A complete check; utter defeat or overthrow.

Part of speech: verb (v.)

1. 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.

2. To defeat completely; to terminate; to thwart. To checkmate and control my just demands. Ford.