line one's pocket

line one's pocket(s) (with sth) (to obtain money, especially by acting dishonestly; to take money freely and especially by dishonest means; to take money illegally to enrich yourself) — обогащаться, наживаться; набивать (себе) карман; прикарманивать, класть себе в карман (о воровстве)

Example 1: The employees lined their pockets with unaccounted money. — Неучтенные деньги прикарманивались служащими.
Example 2: He accused the employers of trying to line their own pockets (with office and campaign funds.)

Related Vocabulary
[грести под себя]