verb (used without object) 1.to commit the first act of hostility or offense; attack first.
verb (used with object) 3.to behave
aggressively toward; attack (often followed by
upon ):
wild animals aggressing their prey.
Origin: 1565–75; <
Latin aggressus (past participle of
aggredī to attack), equivalent to
ag- ag- +
gred- (see
grade) +
-tus past participle suffix