1.skeleton in the closet 家丑不可外扬
 

例句:Everyone has a skeleton in the closet.
谁都有不愿被人知道的秘密。

2.half-brother 同母异父（同父异母）兄弟

例句:He is her half-brother by her father's first marriage.
他是她同父异母的哥哥，是她父亲第一次结婚时生的。

3.come to light 暴露；真相大白

例句:Nothing about this sum has come to light.
关于这笔钱人们一无所知。

4.found out 找出；发现

例句:I found out my phone was bugged.
我发现我的电话被窃听了。