Checkmate
Concise Oxford English Dictionary © 2008 Oxford University Press:
checkmate/tʃekˈmeɪt/
▶noun
- 1 Chess a position of check from which a king cannot escape.
- 2 a final defeat or deadlock.
- 1 Chess put into checkmate.
- 2 defeat or frustrate totally.
– origin ME: from OFr. eschec mat, from Arab. šāh māta, from Pers. šāh māt ‘the king is dead’.
'Checkmate' also found in these Oxford entries:

