UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/əˈgrɛs/US:USA pronunciation: respellingUSA pronunciation: respelling(ə gres)

WordReference Random House Unabridged Dictionary of American English © 2020
ag•gress  (ə gres),USA pronunciation v.i. 
  1. to commit the first act of hostility or offense;
    attack first.
  2. to begin to quarrel.

  1. to behave aggressively toward;
    attack (often fol. by upon):wild animals aggressing their prey.
  • Latin aggressus (past participle of aggredī to attack), equivalent. to ag- ag- + gred- (see grade) + -tus past participle suffix
  • 1565–75

Collins Concise English Dictionary © HarperCollins Publishers::
aggress /əˈɡrɛs/ vb
  1. (intransitive) to attack first or begin a quarrel
Etymology: 16th Century: from Medieval Latin aggressāre to attack, from Latin aggredī to attack, approach
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