IPA: /ˈɡɛrəntɔr/
KK: /ˈɡɛrəntɔr/
A person or organization that promises to take responsibility for someone else's debt or obligations if that person fails to meet them.
The bank required a guarantor before approving the loan.
Guarantor → It is formed from "guarantee" (from Old French *garantir*, meaning to protect or secure) and "-or" (meaning a person who). A guarantor is a person who provides a guarantee or assurance for another's obligation.
Think of someone who 'protects' or 'secures' a promise — that's what a guarantor does.