know what sb is on about

know what Sb is on a·bout

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Definition of know what sb is on about words

phrase know what sb is on about If you say that someone knows what they are on about, you are confident that what they are saying is true or makes sense, for example because they are an expert. 0

noun

adjective

verb

adverb

pronoun

preposition

conjunction

determiner

exclamation

A common word. It’s meaning is known to most children of preschool age. About 95% of English native speakers know the meaning and use the word.

Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

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