Once a case is made that a leak might be imminent, it is checkmate: the agent is thwarted.
Under these circumstances many devices were resorted to to checkmate their political moves.
The Black king cannot be left on any other square without a checkmate being possible.
Therefore, it is imperative that we know Grant's plans so that we can checkmate them.
I do believe the creature'll checkmate me now, all by his ridiculous English heavy persistency!
Two fleets equipped with the new device might checkmate each other.
There's two of us and two of them, and the next move must be ours, or they'll checkmate our king all right.
You and I will try to checkmate that pack if there is anything uncanny in it.
From now on we should be able to checkmate them pretty neatly.
I checkmate you with the little tool I have here—my reserve force.
mid-14c., from Old French eschec mat (Modern French échec et mat), which (with Spanish jaque y mate, Italian scacco-matto) is from Arabic shah mat "the king died" (see check (n.1)), which according to Barnhart is a misinterpretation of Persian mat "be astonished" as mata "to die," mat "he is dead." Hence Persian shah mat, if it is the ultimate source of the word, would be literally "the king is left helpless, the king is stumped."
late 14c.; see checkmate (n.). Related: Checkmated; checkmating.