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Know inside and out
Verb
Definitions
1.
Verb
To know (something or someone) very thoroughly.
"He's still new to their system, but he knows databases inside and out and will understand the rest soon."
Synonyms
know like the back of one's hand
know full well
know like a book
know backwards
sink in
know
beknow
comprehend
deep-dive
know one's way around
grok
have a clue
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