From Longman Dictionary of Contemporary Englishchop something ↔ off phrasal verbCUTto remove something by cutting it with a sharp tool The branch had been chopped off. → chop→ See Verb table
Examples from the Corpus
chop off• Man, I know a guy, they chopped his pinky off.• The tiebreak, chopping sets off in their prime, ruled out a similarly epic match ever taking place again.• The Crows chopped joints off their fingers in mourning so often that they hardly had a whole hand among them. 