Definitions

1. verb

to sign (a loan or document) jointly with another person, especially a parent or guardian signing for a minor.

“She cosigned the loan for her daughter to buy her first car.”

2. verb

to endorse or vouch for (an idea or plan)

“The investors cosigned the new business proposal after seeing its potential.”

3. noun

a person who cosigns a loan or document

“The cosigner agreed to take on the responsibility of paying off the loan if the primary borrower defaulted.”

4. verb

to confirm or agree with (a statement or opinion)

“The expert cosigned the article after reviewing its facts and evidence.”