(tic-tac-toe) A tie game. Comes from the concept that a cat cannot catch its own tail just like a player in tic-tac-toe cannot win a game that is already tied.

(uncountable, chess) A chess opening characterized by the moves 1.d4 d5, in which both White and Black move their queen's pawn to the fourth rank with their first move.

(informal, idiomatic) A situation in which people attempt to blame others rather than trying to resolve a problem.

(idiomatic) A strategy or course of action in which one or more parties refrain from direct action until circumstances change in their favor.

A lottery in which bettors attempt to guess which numbers will later be drawn randomly. / The use of inappropriate statistics (numbers) to reflect a desired result (usually misleading).

(billiards) A form of billiards in which player must name their shots in advance, with a penalty for failing to achieve them.

simple past tense and past participle of head-game

plural of game day

(transitive, idiomatic) To revolutionize a field of endeavor.

A game played in a team, as opposed to individually