be down to

US /bi daʊn tu/
UK /bi daʊn tu/
"be down to" picture
1.

to be the result of a particular thing

:
The success of the project was down to hard work and dedication.
Her poor performance was down to a lack of preparation.
2.

to be someone's responsibility

:
It's down to you to make sure everyone is informed.
The final decision is down to the manager.
3.

to have only a particular amount of something left

:
We're down to our last few dollars.
After all that work, we're down to the final two candidates.