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| co·sign [ kṓ sn, kō sn ] (past and past participle co·signed, present participle co·sign·ing, 3rd person present singular co·signs) |
transitive verb |
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1. sign something jointly: to sign something jointly with one or more other people or representatives of other bodies
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2. sign something as guarantor: to guarantee a loan, lease, or other contractual agreement undertaken by another person by signing the contract along with that person
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  co·sign·er noun |
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