guarantor
n. countable C1 Advanced US //ˌɡɛɹənˈtɔɹ// UK //ɡˈæɹɑːntˌɔː// guar·an·tor
n. a person or company that promises to pay a debt if someone else cannot. You often see this in contracts for loans or when renting an apartment.
n. a person or entity that provides a guarantee for the performance of a duty or the payment of a debt. Often used in legal or financial contexts to describe a third party assuming liability.
The bank asked for a guarantor before approving the loan.
Because the student had no credit history, her parents had to act as guarantors for the apartment lease.
The treaty required a neutral third party to serve as a guarantor, ensuring that both nations would adhere to the terms of the ceasefire agreement.