E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
in the game of chess, means placing your adversarys king in such a position that he can neither cover nor move out of check. Figuratively, to checkmate means to foil or outwit another; checkmated, outmanuvred. Mate (Arabic, mt, dead; Spanish, matar, to kill). The German schach means both chess and check, and the Italian scacco means the squares of the chess-board; but schach-matt and scacco-matto = check-mate. The French échec is a stoppage, whence donner or faire échec et mat, to make a stoppage (check) and dead; the Spanish, xaque de mate means the check of death (or final check).
If we go to Arabic for mate, why not go there for check also? And sheik mat = the king dead, would be consistent and exact. (See CHESS.)