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
Erhard	ER-hahrt (German)	German, Ancient Germanic
Marloes	mahr-LOOS	Dutch
Granya	-	Irish
Susanna	[su:'zænə]
Nedyalko	-	Bulgarian
Jerrold	JER-əld	English