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3. know stuff

know stuff

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know one's stuff

 and know one's onions

to know what one is expected to know. I know my stuff. I can do my job. She can't handle the assignment. She doesn't know her onions.

See also: know, stuff

know your stuff

to know a lot about a subject or be an expert at doing something When it comes to restoring grand pianos, he really knows his stuff.

See also: know, stuff

know your stuff

  (informal)

to know a lot about a subject, or to be very good at doing something When it comes to restoring grand pianos, Mr Morley really knows his stuff.

See also: know, stuff