There are several synonyms for the phrase "be offensive." To offend means to cause someone annoyance, anger or hurt feelings. Related expressions include irritate, provoke, vex, upset, affront, shock and insult. These words all describe the act of causing someone to feel insulted, disrespected or mistreated. Additionally, several phrases can indicate being offensive, including "cross the line," "step on toes," or "go too far." Being mindful of what you say and how you say it can help avoid these situations, as well as being sensitive to others' cultures and backgrounds. Ultimately, it is important to communicate with respect and consideration for others.