sit back

Từ điển Oxford Advanced Learner 8th

ˌsit ˈback derived
1. to sit on sth, usually a chair, in a relaxed position
•He sat back in his chair and started to read.
2. to relax, especially by not getting too involved in or anxious about sth
•She's not the kind of person who can sit back and let others do all the work.
Main entry: ↑sit_derived