you're/he's/she's on
idiom
informal
—used to say that one accepts a bet or challenge
"I bet I can run faster than you can." "OK, you're on."
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“You're/he's/she's on.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/you%27re%2Fhe%27s%2Fshe%27s%20on. Accessed 26 Sep. 2023.
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Merriam-Webster unabridged
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