down to somebody

Từ điển Oxford Advanced Learner 8th

▪ I. be down to sb/sth idiom
to be caused by a particular person or thing
•She claimed her problems were down to the media.
Main entry: ↑down_idiom
 
▪ II. be down to sb idiom
(informal)to be the responsibility of sb
•It's down to you to check the door.
Main entry: ↑down_idiom