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verb
Sign jointly:— Husband and wife co-signed the lease.
synonym: cosign.
is a specific kind of: formalise, formalize, validate.
derivation: cosignatory, cosigner.
Sign and endorse (another person's signature), as for a loan.
is a specific kind of: endorse, indorse.
derivation: cosigner.
Find more on co-sign elsewhere: etymology - rhymes - Wikipedia.
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