give somebody free rein

Từ điển Oxford Advanced Learner 8th

give/allow sb/sth free/full ˈrein | give/allow free/full ˈrein to sth idiom
to give sb complete freedom of action; to allow a feeling to be expressed freely
•The designer was given free rein.
•The script allows full rein to her larger-than-life acting style.
•When I paint I just give my imagination free rein.
Main entry: ↑rein_idiom