IPA: /əˈkjuːzər/
KK: /əˈkyuzər/
A person who claims that someone has done something wrong or illegal, often in a legal context.
The accuser presented compelling evidence in court.
Accuser → It is formed from "ad-" (meaning to) and "causare" (meaning to cause or bring about). The word refers to someone who brings a charge or causes an accusation against another.
Think of someone 'bringing' ('ad-') a 'cause' ('causare') against another person — that's what an accuser does.