know what’s what

know what's what

To know the true facts or most fundamental information (about someone or something). Kid, I've been doing this job for longer than you've been alive, so trust me when I say that I know what's what around here.
See also: know, what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

know what’s what

tv. to be aware of what is going on in the world. We don’t know what’s what around here yet.
See also: know, what
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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