He decided to make a clean breast of what had happened and risk being punished.他决定冒着被惩罚的危险如实坦白发生的一切。I decided to make a clean breast of it/things and admit that I was to blame.我决定彻底坦白，承认自己对此事的过错。You ought to make a clean breast of the whole matter.你最好把整个事件和盘托出。