Checkmate

v. defeat one's opponent by putting his king in an inescapable position (Chess); defeat

n. act of putting an opponent's king in an inescapable position (Chess); downfall, defeat

Checkmate (frequently shortened to mate) is a situation in chess (and in other boardgames of the chaturanga family) in which one player's king is threatened with capture (in check) and there is no way to meet that threat. Delivering checkmate is the ultimate goal in chess: a player who is checkmated loses the game (the king is never actually captured – the game ends as soon as the king is checkmated). In practice, most players resign an inevitably lost game before being checkmated.
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Checkmate is a fictional covert operations agency within the DC Comics universe. It first appeared in Action Comics #598 and proceeded to have its own ongoing title in Checkmate! (vol. 1). In the wake of events depicted in the mini-series The OMAC Project and Infinite Crisis, Checkmate has been re-chartered as a United Nations Security Council-affiliated agency and has its own new series, Checkmate (vol. 2).
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Noun
1. complete victory
(hypernym) victory, triumph
2. a chess move constituting an inescapable and indefensible attack on the opponent's king
(synonym) mate
(hypernym) chess move
(derivation) mate
Verb
1. place an opponent's king under an attack from which it cannot escape and thus ending the game; "Kasparov checkmated his opponent after only a few moves"
(synonym) mate
(hypernym) beat, beat out, crush, shell, trounce, vanquish
(derivation) mate
(classification) chess, chess game

(v. t.)
To defeat completely; to terminate; to thwart.
  

(v. t.)
To check (an adversary's king) in such a manner that escape in impossible; to defeat (an adversary) by putting his king in check from which there is no escape.
  

(n.)
The position in the game of chess when a king is in check and cannot be released, -- which ends the game.
  

(n.)
A complete check; utter defeat or overthrow.
  

Synonyms and related words:
arrest, baffle, bafflement, balk, balking, bell, blast, block, brake, brave, bring to, bring up short, challenge, check, circumvent, confound, confounding, confront, confusion, contravene, counter, counteract, countermand, counterwork, cross, cut short, cutoff, dam, dash, dead stop, deadlock, defeat, defy, destroy, discomfit, discomfiture, disconcert, disconcertion, discountenance, dish, disrupt, draw rein, elude, end, endgame, ending, final whistle, flummox, foil, foiling, freeze, frustrate, frustration, full stop, grinding halt, gun, halt, knock the chocks, lockout, nonplus, perplex, pull up, put paid to, rebuff, repulse, reversal, reverse, rout, ruin, sabotage, scotch, setback, sit-down strike, spike, spoil, stalemate, stall, stand, standoff, standstill, stay, stem, stem the tide, stonewall, stop, stop cold, stop dead, stop short, stoppage, strike, stump, thwart, thwarting, upset, walkout, work stoppage