feather one’s nest 修安乐窝；中饱私囊

【例句】
Old John told his lawyer to use his money after he died to build a hospital for poor people, but the lawyer feathered his own nest with the money instead.
老约翰告诉他的律师把他身后留下的钱给穷人盖一座医院，但是律师没有盖医院，而把那些钱占为己有。

All the time he has been a member of the committee he has been feathering his own nest.
他当委员期间，一直都在谋私利。