A verb from which a more well-known noun is derived.
1. intr. To approach, march forward. Obs. Hence aggressed ppl. a.; also as n.
2. intr. To make an attack; to set upon; ‘to commit the first act of violence; to begin the quarrel.’ J. Const. on. Also transf. (esp. in Psychol. contexts) and const. against. Cf. AGGRESSION 3.
3. trans. To set upon, attack, assault.