interjection
(chess) Word called out by the victor when making a move that wins the game.
(by extension) Said when one has placed a person in a losing situation with no escape.
noun
(chess) The conclusive victory in a game of chess that occurs when an opponent's king is threatened with unavoidable capture.
(figuratively, by extension) Any losing situation with no escape; utter defeat.
verb
(transitive, chess) To put the king of an opponent into checkmate.
(transitive, by extension) To place in a losing situation that has no escape.