co-signer
US /ˈkoʊˌsaɪ.nɚ/
UK /ˈkoʊˌsaɪ.nɚ/
1.
a person who signs a document, especially a loan agreement, jointly with another person or persons, and thereby guarantees payment or performance
:
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My parents had to be a co-signer for my first apartment lease.
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Without a co-signer, I wouldn't have been approved for the car loan.