I don't know about that

idiom

Definition of I don't know about that

used to express doubt about something"She said she'd be here by 5:00." "I don't know about that."

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“I don't know about that.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/I%20don%27t%20know%20about%20that. Accessed 22 Sep. 2020.

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