know inside and out
(Redirected from know something inside and out)
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know inside and out (third-person singular simple present knows inside and out, present participle knowing inside and out, simple past knew inside and out, past participle known inside and out)
- (transitive, idiomatic) 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.
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know (something) very thoroughly
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