Line (one's) (own) pocket(s) phrase
To earn a lot of money by doing something dishonestly or illegally
People's admiration for him changed to hatred when they discovered that he had lined his own pockets since he called for their donation to help the flood-stricken areas.
The sheriff was accused of lining his own pockets from bribery.
Though he is wealthy, he doesn't earn any respect from the surrounding people because they speculate that he has lined his own pockets for years.
The verb" line" must be conjugated according to its tense.
The origin of this phrase is not clear.