·noun A complete check; utter defeat or overthrow.
II. Checkmate ·vt To defeat completely; to Terminate; to Thwart.
III. Checkmate ·noun The position in the game of chess when a king is in check and cannot be released, — which ends the game.
IV. Checkmate ·vt 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.