know one's stuff

To be a master of something, to be competitive in a particular field

Urban Dictionary knows its stuff in slang words definitions (neutrum form of "know one's stuff")

know one's stuff by TomPigeon January 15, 2014

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Related Words

know one's stuff • know one's onions • not know ones ass from ones elbow • Takes One To Know One • it takes one to know one • know what one is about • Not know whether one is Arthur or Martha • Sorry I don't know that one • The Only One I Know • I don't know about that one chief