aggress /əˈɡɹɛs/verb 2noun 1forms 3 verb2 •To set upon; to attack. •To commit the first act of hostility or offense against; to begin a quarrel or controversy with someone; to make an attack against someone. noun1 •Aggression.his aggress / Was made with such precaution as to quench / Douay's intent and throw him in a mess. — 1875 formsaggressed · aggressing · aggresses