Definitions
1.nounThe conclusive victory in a game of chess that occurs when an opponent's king is threatened with unavoidable capture.
2.noun(by extension) Any losing situation with no escape; utter defeat.
3.verbTo put the king of an opponent into checkmate."That jerk checkmated me in four moves!"
4.verb(by extension) To place in a losing situation that has no escape.
5.interjectionWord called out by the victor when making a move that wins the game.
6.interjection(by extension) Said when one has checkmated someone (placed them in a losing situation with no escape.)