I. ˈchek-ˌmāt transitive verb
Etymology: Middle English chekmaten, from chekmate, interjection used to announce checkmate, from Anglo-French eschec mat, from Arabic shāh māt, from Persian, literally, the king is left unable to escape
Date: 14th century
1. : to arrest, thwart, or counter completely
2. : to check (a chess opponent's king) so that escape is impossible
II. noun
Date: 15th century
1.
a. : the act of checkmating
b. : the situation of a checkmated king
2. : a complete check