American English

Definition of cosign verb from the Oxford Advanced American Dictionary



[transitive, intransitive]Verb Forms present simple I / you / we / they cosign he / she / it cosigns past simple cosigned -ing form cosigning
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to sign a document in order to guarantee a loan or other legal commitment cosign something My sister will cosign the loan. cosign (for somebody) Since you don’t have a job, someone must cosign for you.
noun Her dad is the cosigner on her apartment lease.