be down to somebody/something

be down to (one)

To be someone's duty, decision, or responsibility. After your father retires, it will be down to you to lead the company. So I guess it's down to me then.
See also: down
Farlex Dictionary of Idioms.

be down to something

COMMON If something is down to something else, the second thing is the cause of the first. When you are asked to score goals, then a lot is down to confidence and Kevin has that. I think that the show's popularity is down to two things.
See also: down, something
Collins COBUILD Idioms Dictionary, 3rd ed.

be down to somebody/something

(informal)
1 be caused by a particular person or thing: She claimed her problems were down to the media. Our defeat in last week’s game is down to the goalkeeper, who played very badly.
2 be the responsibility of somebody: It’s down to you to check the doors and windows before we leave.
See also: down, somebody, something

be down to something

have nothing except one or a few items of the kind mentioned: I’m down to my last penny.
See also: down, something
Farlex Partner Idioms Dictionary
See also:
  • be down to (one)
  • come a gutser
  • come down with
  • be down to (do something)
  • be down to something
  • bounce up and down
  • close down
  • close down and shut down
  • come a cropper
  • come a-cropper