IPA: /ɪnˈdɔːrsər/
KK: /ɪnˈdɔrsər/
A person who supports or approves something publicly, often by signing or promoting it.
The celebrity was a well-known endorser of the new skincare product.
Endorser → It is formed from "endorse" (from Old French *endorser*, meaning to give support or approval) and "-er" (meaning a person who). An endorser is a person who gives support or approval to something, typically a product or idea.
Think of someone who gives their support or approval — that's what an endorser does.