负荆请罪

负荆请罪 [fù jīng qǐng zuì]

1. ■ bearing the rod and willingly taking the punishment -- to offer a humble apology; bare one's back to be threshed -- to show contrition; bring a rod on one's back and ask for punishment; carry a rod and ask to be spanked; carry a rod on one's back and ask for punishment; make a humble apology; make an abject apology; make to apologize for wrongdoing; the deepest possible apology one can make to another:

你最好是负荆请罪， 我相信他会原谅你。 You'd better go and make amends to him. I'm sure he'll forgive you.