tell (someone) what's what

(redirected from tell her 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 ?
Canton, Cardiff AMaybe not, but you can tell her what's what! If you're just a girl who can't say n-n-no, this lady will keep draining you of energy, time and money.