Definition of (I/I'll) tell you what
informal
—used to introduce a suggestion or to emphasize a statement (I'll) Tell you what—I'll let you borrow the car if you fill it up with gas.I tell you what, I wouldn't pay that much for a pair of shoes.
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“(I/I'll) tell you what.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/%28I%2FI%27ll%29%20tell%20you%20what. Accessed 2 Mar. 2021.
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