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. © 2022 Farlex, Inc, all rights reserved.
line (one's) pockets
To make a profit, especially by illegitimate means.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
line one's pockets, to
To accept bribes, or acquire money in some other questionable way. One writer claims that this term originated when a court tailor who wanted the patronage of Beau Brummel gave him a gift of a coat lined with banknotes. However, the term to line one’s purse, meaning to cram it full of gold or money, predates the eighteenth-century dandy by some two hundred years; Shakespeare used it in Othello (1.1), where Iago speaks of dishonest servants who “have lin’d their coats.”
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer