A sharp comment is a remark that is made in a cutting or sarcastic manner. The term can be broken down into two crossword solutions: BARB (4 letters) and JAB (3 letters). A BARB is a word or phrase that is intended to hurt or insult someone, while a JAB is a quick, sharp blow or remark. Together, these two words form the phrase 'sharp comment, ' which describes a remark that is made with the intention of hurting or insulting someone.