not know the first thing about (something)

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not know the first thing about (something)

To not know anything about something. I don't know the first thing about computers, so you'll have to explain this to me really slowly. What's an attachment again? Geoff wouldn't know the first thing about how to take care of a baby. Thank goodness Frank is there to help babysit.
See also: first, know, not, thing

not know the first thing about someone or something

Fig. not to know anything about someone or something. I don't know the first thing about flying an airplane. She doesn't know the first thing about John.
See also: first, know, not, thing
References in periodicals archive ?
One furious resident said: "Enda Kenny can f**k off, him and his shower wouldn't know the first thing about helping us.
Mallika: And you darling, wouldn't know the first thing about representing India abroad.
My neighbor told me they are used when someone's heart stops, but I wouldn't know the first thing about how to use one.
At his father's home in Coatbridge, Lanarkshire, he said: "I wouldn't know the first thing about the UVF and I don't even remember what I was singing.
They're just dolts, pathetic exhibitionists who wouldn't know the first thing about real style.
s advertising efforts, general merchandise manager Steve Elliot admits he wouldn't know the first thing about laying out a circular.
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