on one's game

idiom

Definition of on one's game

: playing a sport or game well She's really on her game tonight. often used figurativelyHe 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 15 Jan. 2021.

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