know what's what

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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

know what's what

If you know what's what, you know the important things that need to be known about a situation. You have to know what's what and when to draw the line. You should come across the river with us. Then you will really see what's what.
See also: know, what

know what's what

have enough knowledge or experience. informal
1992 More I know what's what at work, so no-one's going to trip me up.
See also: know, what

know what’s ˈwhat

(informal) know all that needs to be known in a particular situation or in general: Ask Ann. She knows what’s what. She’s been here for years.
See also: know, what