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
Kimi	KEE-mee	Finnish
Aman	['æmən]
Fu	-	Chinese
Latonya	-	African American
Thamar	-	Biblical Greek, Biblical Latin
Kunala	-	Sanskrit