Definition of on one's game
: playing a sport or game well
She's really on her game tonight.
—often used figuratively He was really on his game in last night's debate.
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“On one's game.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20one%27s%20game. Accessed 6 Jul. 2022.
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