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.Farlex Partner Idioms Dictionary © Farlex 2017