not know the first thing about
idiom
: to have little or no knowledge about (something or someone)
I don't know the first thing about children.
Examples of not know the first thing about in a Sentence
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Leaders and professionals who are laser-focused on building their businesses from the ground up may not know the first thing about building a podcast, as well.
—
Ginni Saraswati, Forbes, 9 Aug. 2022
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Ginni Saraswati, Forbes, 9 Aug. 2022
Cite this Entry
“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 31 Oct. 2025.
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