/ɪˈnɪʃəl əˈɡrɛsər/ – Phrase
Definition: kẻ gây nên cuộc xung đột, bên tiến công, bên gây hấn.
A more thorough explanation: An initial aggressor is a person who first uses physical force or threatens to use physical force against another individual, thereby initiating a confrontation or altercation.
Example: In a self-defense case, the court found that the defendant was the initial aggressor when he instigated the physical altercation.