I don't know about him/her

idiom

Definition of I don't know about him/her

used to say that one is uncertain about someoneI don't know about him—he's hard to figure out.

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

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