not know the first thing about

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

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.
References in periodicals archive ?
It could have sent a couple of civil servants for special training if it was unable to find a qualified person for the job in Cyprus, instead of employing a cop that did not know the first thing about running a prison.
It means that Suzuki does not know the first thing about environmental economics.
Frankly," the executive said to me, "we do not know the first thing about these applications and how they apply to us.
Up until recently Brett Ratner did not know the first thing about Bollywood movies, but that did not stop the US director being snapped up to helm one.
Unfortunately, many troubled teens who are pregnant or have a baby do not know the first thing about bonding with their child.
I did not know the first thing about dairying but we knew there was a quicker return,' Dai said.
Let those who criticize my campaigning direct their ire at my opponents, who posture and preen but do not know the first thing about legislative craftsmanship or the right to privacy.
Of those without a private pension, 60 per cent confessed that they did not know the first thing about pensions - compared to only 45 per cent nationally and 57 per cent complained about sales people not explaining the Economics Editor details clearly enough.
To be beached is bad if you are a whale [the beach balls boo and blow raspberries] but it is worse if you are a sailor, pestered morning and night by native girls [cheers, whistles] who frequently do not know the first thing about proper dress [catcalls, stomping of feet, showers of confetti; the beach balls cluster around the author and roll him into the sea].
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