肉袒负荆

⒈  赤裸上身，背着荆条请罪，表示愿受责罚。

例廉颇闻之，肉袒负荆，因宾客至蔺相如门谢罪。——《史记·廉颇蔺相如列传》

英strip off the upper garment as a token of sincere apology——ready to submit to any punishment the other party may want to give;