Know somebody/something inside out
phrase
To understand or be familiar with someone or something in a very detailed way.
He's been working on this project for a year now, he knows it inside out.
Often appears as...
- know the subject inside out
- know the city inside out
Usage tips
Idiomatic
phrase
To know someone's character and behavior very well.
They've been best friends since kindergarten, they know each other inside out.
Often appears as...
- know a friend inside out
- know a partner inside out
Usage tips
Idiomatic
phrase
To understand or be familiar with someone or something in a very detailed way.
He's been working on this project for a year now, he knows it inside out.
Often appears as...
- know the subject inside out
- know the city inside out
Usage tips
Idiomatic
phrase
To know someone's character and behavior very well.
They've been best friends since kindergarten, they know each other inside out.
Often appears as...
- know a friend inside out
- know a partner inside out
Usage tips
Idiomatic
Definition 1 of 2
Pro Tip 1/3Detail Significance
Emphasizes extensive knowledge about intricate details of a subject or a system.
The mechanic knows that car inside out; no one else should touch it.
Pro Tip 2/3Expert Implication
Implies a level of expertise or professionalism in a particular area.
She knows the software inside out and can solve any issue that arises.
Pro Tip 3/3Not Literal
It's a figurative term; you don't actually see the inside of a topic.
Despite the name, health inspectors don't actually know every restaurant inside out.
Pro Tip 1/3Detail Significance
Emphasizes extensive knowledge about intricate details of a subject or a system.
The mechanic knows that car inside out; no one else should touch it.
Pro Tip 2/3Expert Implication
Implies a level of expertise or professionalism in a particular area.
She knows the software inside out and can solve any issue that arises.
Pro Tip 3/3Not Literal
It's a figurative term; you don't actually see the inside of a topic.
Despite the name, health inspectors don't actually know every restaurant inside out.
Pro Tip 1/3Detail Significance
Emphasizes extensive knowledge about intricate details of a subject or a system.
The mechanic knows that car inside out; no one else should touch it.
Pro Tip 2/3Expert Implication
Implies a level of expertise or professionalism in a particular area.
She knows the software inside out and can solve any issue that arises.
Pro Tip 3/3Not Literal
It's a figurative term; you don't actually see the inside of a topic.
Despite the name, health inspectors don't actually know every restaurant inside out.
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