noun (used with a singular verb) British.
- tick-tack-toe(def 1).
noun
- (functioning as singular) a game in which two players, one using a nought, “O”, the other a cross, “X”, alternately mark one square out of nine formed by two pairs of crossed lines, the winner being the first to get three of his symbols in a rowUS and Canadian term: tick-tack-toe, (US) crisscross