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.verbjump to other results
NAmE//ˈkoʊsaɪn//[transitive, intransitive]Verb Forms present simple I / you / we / they cosign he / she / it cosigns past simple cosigned -ing form cosigning
cosignerjump to other results
NAmE//ˈkoʊˌsaɪnər//noun Her dad is the cosigner on her apartment lease.