A co-signer is someone who signs a loan or agreement with another person and assumes responsibility for the debt if the original borrower is unable to repay it. Full definition
In fact, unsecured loan approval is still very much possible, provided the applicant has either time on their side, a trusting co signer or a lender that is willing to turn a blind eye to credit history and insist on automatic unsecured loan repayments direct from their bank account. (badcreditloanservices.com)
Student Loan Co signer Warning Thinking about co-signing for a relative in need of a college loan? (usstudentloancenter.org)