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know inside out

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know something inside out

to know something thoroughly; to know about something thoroughly. I know my geometry inside out. I studied and studied for my driver's test until I knew the rules inside out.

See also: inside, know, out

know something inside out

to know everything about something I know this machine inside out.

See also: inside, know, out

know something inside out

  (informal)

to know everything about a subject Why don't you ask Mike? He knows the system inside out.

See also: inside, know, out