Meaning of barb
Definition of barb
(noun)
an aggressive remark directed at a person like a missile and intended to have a telling effect; "his parting shot was `drop dead'"; "she threw shafts of sarcasm"; "she takes a dig at me every chance she gets"
a subsidiary point facing opposite from the main point that makes an arrowhead or spear hard to remove
(verb)
provide with barbs; "barbed wire"