When it comes to expressing aggression or a strong offensive stance, there are several synonyms for the phrase "on the attack". Firstly, we have "launching an assault", which vividly portrays a forceful and offensive action. Another option is "making an offensive move", emphasizing a proactive and assertive approach. "Engaging aggressively" conveys the idea of actively confronting an opponent. Furthermore, one can say "taking the offensive", signifying a decision to initiate an attack rather than merely defending. Finally, we have "going on the offensive", which implies a strategic decision to adopt a strong attacking position. These alternative expressions capture the essence of "on the attack" and can be used interchangeably to convey a sense of assertiveness and aggression.