▪ I.aggressing,vbl.n.|əˈgrɛsɪŋ|[f.aggress v. + -ing¹.]The action of attacking; commencing an attack.1879H. SpencerData of Ethics viii. §52. 139Whether men live together in quite independent ways, careful only to avoid aggressing.▪ II.aggressing,ppl.a.|əˈgrɛsɪŋ|[f.asprec.+ -ing².]Commencing the attack, assailing.a1714[See aggress v. 2].1775AdairAmer.Indians 380The aggressing party usually send..a friendly embassy to the other, praying them to accept of equal retribution.