know what's what
if you know what's what, you have a lot of experience and can judge people and situations well

[TahlilGaran] Dictionary of Contemporary English ▲

know what's what
if you know what's what, you have a lot of experience and can judge people and situations well.
Harry's been in the business for 40 years - he knows what's what.

[TahlilGaran] English Idioms Dictionary ▲

know what's what
know the facts about something
It was difficult to determine what's what with the man's problem.

[TahlilGaran] English Idioms Dictionary ▲

know what's what
See: KNOW SOMETHING INSIDE OUT.

[TahlilGaran] English Idioms Dictionary ▲