what's what

(spoken)

the information about a person or situation You finally met her boyfriend, so now you know what's what. He's been in this business for a long time and really understands what's what. It will be hard for investors to tell what's what in the current stock-market crisis.

what's what

Informal

The fundamentals and details of a situation or process; the true state or condition.

Common Names:

Name	Pronounced	Usage
Samantha	sə-MAN-thə (English)	English, Italian, Dutch
Calixte	-	French
Ricarda	['rika:dz]
Freeman	['fri:mən]
Sam (3)	SAM (English)	Literature
Gu&Eth;Leif	-	Ancient Scandinavian