May I tell (someone) who's calling?(redirected from may I tell one who's calling)
May I tell (someone) who's calling?
A polite request for the identity of a caller who is asking to speak to someone. A: "May I speak to Josh, please?" B: "Of course. May I tell him who's calling?"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.