I don't know about you/him/her/them

idiom

—used say that one is uncertain whether someone thinks or feels differently about something
I don't know about you, but I'm leaving.

Dictionary Entries Near I don't know about you/him/her/them

I don't know about that

I don't know about you/him/her/them

I don't mind if I do

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“I don't know about you/him/her/them.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/I%20don%27t%20know%20about%20you%2Fhim%2Fher%2Fthem. Accessed 1 Dec. 2023.

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