go cap in hand to somebody

Từ điển Oxford Advanced Learner 8th

go cap in ˈhand (to sb) idiom
(BrE) (US go hat in ˈhand)to ask sb for sth, especially money, in a very polite way that makes you seem less important
•There's no way he'll go cap in hand to his brother.
Main entry: ↑cap_idiom