not know the first thing about somebody/something
not know the first thing about (someone or something)
To not know anything about someone or 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. Why do you presume to know what I would or wouldn't do? You don't know the first thing about me!
See also: first, know, not, thing
Farlex Dictionary of Idioms.
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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
not know the first thing aˈbout somebody/something
know nothing at all about somebody/something: I don’t know the first thing about Chinese history.See also: first, know, not, somebody, something, thing
Farlex Partner Idioms Dictionary
- closed book, a
- a closed book
- before you know it
- before you know where you are
- I know
- know (someone or something) inside out
- know inside out
- know somebody/something inside out
- know someone or something inside out
- know something/someone inside out