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aggress upon

 - 1 dictionary result

ag⋅gress

[uh-gres]
–verb (used without object)
1. to commit the first act of hostility or offense; attack first.
2. to begin to quarrel.
–verb (used with object)
3. to behave aggressively toward; attack (often fol. by upon): wild animals aggressing their prey.

Origin:
1565–75; < L aggressus (ptp. of aggredī to attack), equiv. to ag- ag- + gred- (see grade ) + -tus ptp. suffix
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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