feather one's nest
feather one's nest {v. phr.}, {informal}
1. To use for yourself money and power, especially from a public office or job in which you are trusted to help other people.
The rich man 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.
The man feathered his nest in politics by getting money from contractors who built roads.
Syn.: LINE ONE'S POCKETS.
2. To make your home pleasant and comfortable; furnish and decorate your house.
Furniture stores welcome young couples who want to feather their nests.
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Source: A Dictionary of American Idioms