Meaning of co-sign in English:

co-sign

Pronunciation /ˌkəʊˈsʌɪn/

See synonyms for co-sign

verb

[with object]
  • 1North American Sign (a loan or lease) jointly with another person in order to guarantee payment.

    ‘you may have to get someone to co-sign your loan if you do not have a previous credit history’
    • ‘see if your parents will co-sign for you’
  • 2North American Sign (a document) jointly with another or others.

    • ‘he is joined by a host of musical artists who co-signed an open letter to the US Congress’
    1. 2.1informal Endorse or agree with.
      • ‘I co-sign all the advice on this thread’