ag·gres·sor /əˈgrɛsɚ/ 名詞
Ag·gres·sor n. The person who first attacks or makes an aggression; he who begins hostility or a quarrel; an assailant.
The insolence of the aggressor is usually proportioned to the tameness of the sufferer. --Ames.
n 1: someone who attacks [syn: attacker, assailant, assaulter]
2: a confident assertive person who acts as instigator