What is another word for cosign?
Pronunciation: [kˈɒsa͡ɪn] (IPA) 
The word cosign can be replaced with a variety of synonyms depending on the context. For example, endorse, vouch for, support, guarantee, affirm, and validate are all synonyms for cosign when it means to give approval or assurance to a document or a person. In the financial context, cosign can be substituted with terms like underwrite, back, and collateralize. When it means to sign a document jointly with someone else, cosign can be replaced with co-signature, jointly sign, or sign with another. In everyday language, cosign can be substituted with phrases such as lend credibility, give credence to, back-up, or approve wholeheartedly.
