to make a lot of money for yourself Allowing patients to sue will increase the cost of health insurance and line lawyers' pockets.He was using his position as an immigration official to line his pockets.
Usage notes: usually said about a person who either makes money illegally or takes more than is fair or right
if money or a system is lining someone's pockets, that person is receiving too much money or is receiving money that is not intended for them There's to be an investigation following allegations that the money raised is lining the pockets of officials.
to make a lot of money in a way that is not fair or honest Sharp resigned after allegations that he had been lining his pockets during his time as company director.