Learn how to say Checkmated correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word checkmate:
the winning position in which an opponent’s king is under attack and unable to escape
the move by which this position is achieved
(chess) to place (an opponent’s king) in checkmate
to thwart or render powerless
(chess) a call made when placing an opponent’s king in checkmate
C14: from Old French eschec mat, from Arabic shāh māt, the king is dead; see check