stoop to

to drop your moral standards to do sth bad or unpleasant 卑鄙（或堕落）到做某事
You surely don’t think I’d stoop to that!
你不会认为我会下作到那种地步吧！
stoop to doing sth
I didn’t think he’d stoop to cheating.
我觉得他总不至于作弊吧。