pull your punches
US /pʊl jʊər ˈpʌn.tʃɪz/
UK /pʊl jʊər ˈpʌn.tʃɪz/

1.
手下留情, 有所保留, 不尽力
to hold back or limit the force of one's criticism or actions
:
•
The reviewer didn't pull any punches, criticizing every aspect of the film.
评论家没有手下留情,批评了电影的每一个方面。
•
You need to tell him the truth; don't pull your punches.
你需要告诉他真相;不要手下留情。