breastbeating
noun [ U ] (also breast-beating) uk/ˈbrest.biː.tɪŋ/ us/ˈbrest.biː.t̬ɪŋ/
捶胸顿足（以表示悲哀或内疚的程度）
actions that show in an obvious or public way how sad or guilty you feel
Some British public figures have indulged in breastbeating about colonialism. 一些英国公众人物肆意显露自己对殖民主义的愧疚。