Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “know sth inside out”

know sth inside out

informal
C1 to know everything about a subject : He knows the system inside out.Experts and specialists Grammar:InsideInside is an adjective, noun, adverb or preposition. We use inside when we refer to the inner part of something.
(Definition of know sth inside out from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Definitions of “know sth inside out” in other dictionaries

Word of the Day

familiarity

a good knowledge of something, or the fact that you know it so well

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More