Definition, Meaning & Synonyms

know-someone-or-something-inside-out

idiom

/noʊ ˈsʌmoʊn ɔr ˈsʌmθɪŋ ˈɪnˌsaɪd aʊt/

Definition

To understand someone or something completely and thoroughly.

Examples

She knows the new software inside out, making her the go-to person for any questions.
After years of working together, I feel like I know John inside out.
The author has researched the topic so thoroughly that he knows the history of the city inside out.

Meaning

This phrase means to have a comprehensive knowledge of a person’s character or the workings of a process, often implying an intimate familiarity with all aspects.