Twist somebody's arm - Idioms by The Free Dictionary
twist somebody's arm
twist (one's) arm
To pressure or force someone into doing something. Oh, she immediately agreed to come tonight—I didn't even have to twist her arm.
ˌtwist somebody’s ˈarm (informal, often humorous) force or persuade somebody to do something, but not by using physical force: ‘Do you think Jane will lend us her car?’ ‘I think we could probably twist her arm.’