负荆请罪 (fù jīng qǐng zuì): lit. to bring a bramble and ask for punishment; fig. to offer sb a humble apology

jīngqǐngzuì

lit. to bring a bramble and ask for punishment; fig. to offer sb a humble apology

A general came bearing a birch rod and asked to be flogged. For an apology that offers to take the punishment.