Is there an idiom in English to describe someone who thinks he/she is smarter/wiser than everyone else?
In Polish, we have an idiom, which literally translated, would sound like:
He/she has eaten all minds
Learn English – An idiom to describe someone who thinks he/she is wiser than others
idiomspejorative-languagephrase-requests
Best Answer
In English, a common term for such a person is "know-it-all", as in:
Usually the phrase has a slightly negative connotation to it, because it implies that the person really doesn't know it all, but they might act arrogant as if they do know it all.