fork out for something

Từ điển Oxford Advanced Learner 8th

ˌfork ˈout (for sth) | ˌfork ˈout sth (for/on sth) derived
(informal)to spend a lot of money on sth, especially unwillingly
•Why fork out for a taxi when there's a perfectly good bus service?
•We've forked out a small fortune on their education.
Main entry: ↑fork_derived