You'd better come clean.
你最好坦白交待。
come clean 直译过来就是：“变干净”，所以这个短语的正确意思是：“全盘招供，坦白交待，和盘托出”。因此，当美国人说"You'd better come clean."时，他/她要表达的意思就是:"You'd better tell the truth."、"You'd better not tell lies."、"You'd better be frank."。
情景对白：
Colleague: The personnel manager doubts about my forged degree. What should I do?
同事：人事经理怀疑我的假学历，怎么办?
Benjamin: You'd better come clean. Maybe he will keep you in view of your good performance.
本杰明：你最好坦白交待，或许他考虑到你的表现很好而留下你。
搭配句积累：
①I've involuntarily accepted a large amount of rebate from a company.
我身不由己，从一家公司收受了一大笔回扣。
②I have lost an important document. What shall I do?
我弄丢了一份重要的文件，怎么办啊?
③I broke our manager's favorite potting. Should I tell him?
我打碎了经理钟爱的盆栽。我应该告诉他吗?
④I'm afraid that the boss might have known my mistake.
恐怕老板已经知道我的过失了。
单词：
involuntarily adv. 身不由己地
Another surge of pain in my ankle caused me to give an involuntary shudder.
脚踝突然又一阵疼痛，痛得我直打哆嗦。
I shivered involuntarily with an inexplicable dread.
我怀着莫名其妙的恐惧，身不由己地不寒而栗。
Love is not to say that and should not, sometimes involuntarily pay nothing.
爱,也不是说该与不该,有时是身不由己的付出罢了。
