|Origin:||eschec mat, from Arabic shah mat, from Persian, 'the king is left helpless'|
check‧mate [uncountable and countable]
the position of the king (=most important piece) in chess at the end of the game, when it is being directly attacked and cannot escape
a situation in which someone has been completely defeated
—checkmate verb [transitive]
The king is checkmated and the game is over.