tell (someone) what's what

To inform someone of the true facts or most fundamental information (about someone or something). After putting it off for a week, Sarah finally told Jane what's what and ended their relationship. You're so na?ve about the way you think this business operates, so allow me to finally tell you what's what.

Common Names:

Name	Pronounced	Usage
Gaubert	-	French
Hlengiwe	-	Southern African, Zulu
Cathleen	kath-LEEN	Irish, English
Gordy	GAWR-dee	English
Lucille	[lu:'si:l]
Sang-Hun	sahng-hoon	Korean