chuck in

(slang) To quit (something, especially a job).

(transitive, idiomatic) To contribute (something).

Chuck it in is informal British and Australian slang meaning to quit something — most often a job, project, or relationship that has become more trouble than it is worth. The phrase has a decisive, no-nonsense energy: you are not gracefully stepping down, you are tossing the whole thing aside. It often appears at moments of peak frustration, when someone has finally hit their limit and decided that walking away beats grinding on.

(slang, transitive) To discard, to dispose of (something).