not know the first thing about

idiom

Definition of not know the first thing about

: to have little or no knowledge about (something or someone) I don't know the first thing about children.

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“Not know the first thing about.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/not%20know%20the%20first%20thing%20about. Accessed 20 Sep. 2020.

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