Who is it?

Who is it?

Who is the person on the other side of a door or end of the telephone line? "Yes? Who is it?" I called out in response to the knocking. A: "Someone on the phone for you, boss." B: "Who is it?"
See also: who
Farlex Dictionary of Idioms.
See also:
  • buzz into a place
  • answer the door
  • knock boots
  • knock boots (with one)
  • knock at
  • knock at (something)
  • foot-in-the-door
  • on the knocker
  • last thing
  • knock on