American English

Definition of cosign verb from the Oxford Advanced American Dictionary

 

cosign

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