IPA: /ɪnˈʃʊrə/
KK: /ɪnˈʃʊrər/
A person or company that provides insurance coverage to protect against financial loss or damage.
The insurer approved my claim after reviewing the documents I submitted.
Insurer → It is formed from "in-" (meaning into or within) and "surer" (from the Old French *surer*, meaning to assure or guarantee). The word "insurer" refers to a person or entity that provides assurance or guarantees against risk.
Think of someone who provides a guarantee ('surer') to protect you from risks ('in-') — that's what an insurer does.