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aggressor

[ uh-gres-er ]
/ əˈgrɛs ər /
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noun
a person, group, or nation that attacks first or initiates hostilities; an assailant or invader.
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Origin of aggressor

1670–80; <Late Latin, Latin aggred- (stem of aggredī to attack; see aggress) + -tor-tor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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