I'll get back to you

I'll get back to (someone)

I'll communicate with you at a later time or date. Tell Jill that I'll get back to her about that business proposal after the weekend. I'll get back you later, I'm just on my way out the door.
See also: back, get
Farlex Dictionary of Idioms.

I'll get back to you (on that).

 and Let me get back to you (on that).
I will report back later with my decision. (More likely said by a boss to an employee than vice versa.) Bob: I have a question about the Wilson project. Mary: I have to go to a meeting now. I'll get back to you on that. Bob: It's sort of urgent. Mary: It can wait. Sue: Shall I close the Wilson account? Jane: Let me get back to you on that.
See also: back, get
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • back door
  • dial (one) back
  • dial back
  • come back and see us
  • back
  • back at (something or some place)
  • be/go back to square one
  • a while back
  • break one's neck, to
  • back to square one