tell (someone) what's what

(redirected from telling us what's what)

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 naïve about the way you think this business operates, so allow me to finally tell you what's what.
See also: tell, what
References in periodicals archive ?
If you were making a list, another bossy middle-class boiler telling us what's what would be unlikely to feature in the Top 20.