co·sign 
(kō-sīn)
(kō-sīn)tr.v. co·signed, co·sign·ing, co·signs
1. To sign (a document) jointly.
2. To endorse (another's signature), as for a loan.
co·signer n.
- vascular bundle
- vascular cambium
- vascularity
- vascularization
- vascularize
- vascular plant
- vascular tissue
- vasculature
- vasculitis
- vasculum
- vas deferens
- vase
- vasectomize
- vasectomy
- vas efferens
- Vaseline
- Vashon Island
- Vaslav
- vaso-
- vasoactive
- vasoactivity
- vasoconstriction
- vasoconstrictive
- vasoconstrictor
- vasodilatation