line one's pockets


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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

line one's pockets

Accept a bribe or other illicit payment, as in The mayor and his cronies found dozens of ways to line their pockets. This expression dates from the mid-1500s, when it was also put as line one's purse.
See also: line, pocket