Know somebody/something inside out
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.
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