To line one's pockets means to obtain or make a large amount of money in a dishonest, immoral or illegal way, usually by exploiting others or leaving other people worse off or at a disadvantage. This is an idiom used in social and professional contexts. On the surface, this expression could seem similar to 'earn/make a fortune,' or 'make a killing,' as they also denote obtaining a large amount of money. However, the use of 'line one's pockets' implies that the money was either obtained through dishonest or illegal means, or in a greedy way that prioritized financial reward over something more admirable.

1. At the company's AGM, the CEO was accused of being more interested in lining her own pockets than expanding the business.
2. An internal investigation found that Frank had lined his pockets with money from clients' accounts.
3. Winning that contract is huge for the business. It will line our pockets for years!

1. It is apparent that the government are more interested in lining their pockets than in helping its citizens get housing and access to education.
2. The tax on eating out is just another way for authorities to line their pockets.