Definition of on one's game
- She's really on her game tonight.
- He was really on his game in last night's debate.
: activity engaged in for diversion or amusement : play
: the equipment for a game
: often derisive or mocking jesting : fun, sport
: to play for a stake
: to lose or squander by gambling
: to take dishonest advantage of : cheat
: having or showing a resolute unyielding spirit
: willing or ready to proceed
: of or relating to game
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