A cutting remark or a sharp point, perhaps on a fishhook
... Barb - Cutting remark Barb - Zinger Barb - 
Fishhook's end Barb - Stinging remark Barb - Fishhook feature Barb - Nasty... [DOC] [TLE] BARB - Crossword Clues | Wordplays.com [PAR] Sharp point on a livestock fence.