not know the first thing about (someone or something)

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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. © 2015 Farlex, Inc, all rights reserved.

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. © 2002 by The McGraw-Hill Companies, Inc.

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.
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
If you're bad at book-keeping and accounts, or don't know the first thing about customer service or after-sales care, you should embark on a relevant training course.
His classes include students of all levels--in one of his classes, he is supposed to be teaching 11th graders World History at the same time he is teaching 10th graders American History--and some of them are recent immigrants who don't know the first thing about either topic.
"Heck, everybody knows Democrats don't know the first thing about winning Senate campaigns."
"I may have bumped into him at a World Cup somewhere, but, if I did, he obviously didn't make an impression on me because I don't know the first thing about him.
Even if they don't know the first thing about what is being discussed - whether it's a router, a carburetor or an Ordnance Survey map - they feel compelled to voice an opinion.
"But growing up in that era was not easy for any of us and that's why it hurts when I hear people calling me this or that when they don't know the first thing about me.
What is the point of people fighting for equality when our own community are happy to perpetuate lazy stereotypes of gay people as materialistic, consumer-obsessed and enamoured of awful, naff pop acts who don't know the first thing about being gay?
Although many people in the North East take vitamins, eat organic foods and drink pro-biotic yoghurts in an attempt to feel good, they often don't know the first thing about looking after their minds.
"Many of the people who now pour scorn on my father and the way the war was fought don't know the first thing about it."
I don't know the first thing about cars or how to sell them.
Most of the knee-jerk reactions came from people who don't know the first thing about me, my illness or what it involves."
While sympathetic to those charged with running the bank, he said, 'They don't know the first thing about a biotech business - as much as I don't know the first thing about a steel business.
We printed a selection but the one that tickled me most was: "Murray foot, I think you're a total f***y and don't know the first thing about music.
I don't know the first thing about classical music or opera, but I can tell a fantastic singer when I hear one.
Most people watching the Ireland game don't know the first thing about the sport.
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