Meaning 1 ►▼
the king in chess cannot move or he is captured and the game is won
She won the game after checkmating her opponent's king.
Meaning 2 ►▼
To put someone is a position where they must lose
Kuwait was in a checkmate position when Iraq massed troops on her border.
This term, used in the ancient game of chess, derives from the Arabic, "Shah mat!" ( The king is dead), then Spanish, "xaque mate", then French, "eschec mat", then early English, "chek mate".