to cosign

listen to the pronunciation of to cosign
English - English
To sign a document jointly with another person, sometimes as an endorsement
To sign (a document) jointly
To endorse (another's signature), as for a loan
sign jointly; "Husband and wife co-signed the lease"
sign and endorse (another person's signature), as for a loan
{f} sign jointly, sign as a cosigner, sign a document along with other signers; endorse the signature of another person (as promissory note or for a loan)