aggress upon


verb (used without object)
to commit the first act of hostility or offense; attack first.
to begin to quarrel.
verb (used with object)
to behave aggressively toward; attack (often followed by upon ): wild animals aggressing their prey.

1565–75; < Latin aggressus (past participle of aggredī to attack), equivalent to ag- ag- + gred- (see grade) + -tus past participle suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aggress (əˈɡrɛs)
(intr) to attack first or begin a quarrel
[C16: from Medieval Latin aggressāre to attack, from Latin aggredī to attack, approach]

Collins English Dictionary - Complete & Unabridged 10th Edition
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