IPA: /ˈbætərər/
KK: /ˈbætərər/
A person who physically attacks someone, often in a domestic setting, causing harm or injury.
The police arrested the batterer after receiving reports of domestic violence.
Batterer → It is formed from "batter" (from Old French *battre*, meaning to beat) and "-er" (meaning a person who). A batterer is a person who beats or strikes.
Think of someone who 'beats' ('batter') — the '-er' indicates that this person is the one doing the action.