line your pocket

line (one's) (own) pocket(s)

To make a large amount of money for oneself in a way that is considered greedy or dishonest. The phrase typically implies that one is prioritizing making money above some other, more admirable goal. He doesn't care about creating some digital utopia—he's just trying to line his own pockets. This new contract is going to line our pockets for years.
See also: line
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

line your pocket (or pockets)

make money, usually by dishonest means.
See also: line, pocket
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in periodicals archive ?
Money can't buy everything and you can't buy an oasis like this to line your pockets.
Do away with the trash; line your pockets with cash.