IPA: /ɪnˈfrɪn.dʒər/
KK: /ɪnˈfrɪnʤər/
A person who violates or breaks a law, rule, or agreement.
The company took legal action against the infringer for using their copyrighted material without permission.
Infringer → It is formed from "infringere" (from Latin, meaning to break or violate) and the suffix "-er" (meaning a person who). An infringer is a person who breaks or violates a law or right.
Think of someone who 'breaks' ('infringere') a rule or right — that's why an infringer is a person who violates something.