Definition of aggress

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ag·gress    (-grs) KEY 

intr.v.
ag·gressed, ag·gress·ing, ag·gress·es

To initiate an attack, war, quarrel, or fight: "America . . . guaranteed that no EC state would aggress against another" (John J. Mearsheimer).

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ETYMOLOGY:
French agresser, from Latin aggred, aggress-, to attack : ad-, ad- + grad, to go; see ghredh- in Indo-European roots