sit back

phrasal verb
1
to sit on something, usually a chair, in a relaxed position
لم دادن, راحت نشستن, آرام نشستن, پشت تکیه دادن, نشستن به حالت راحت
2
to relax, especially by not getting too involved in or anxious about something
استراحت کردن, ریلکس کردن, آرامش یافتن, آرام گرفتن
She's not the kind of person who can sit back and let others do all the work.
How can you sit back and watch him suffer?