/euh gres"/ , v.i.
1. to commit the first act of hostility or offense; attack first.
2. to begin to quarrel.
v.t.
3. to behave aggressively toward; attack (often fol. by upon ): wild animals aggressing their prey.
[ 1565-75; aggressus (ptp. of aggredi to attack), equiv. to ag- AG- + gred- (see GRADE) + -tus ptp. suffix ]