- co-sign, cosign - sign jointly; "Husband and wife co-signed the lease"
--1 is one way to validate, formalize, formalise
Sample sentences:Derived form: noun cosigner1
Somebody ----s
Somebody ----s something
- cosign, co-sign - sign and endorse (another person's signature), as for a loan
--2 is one way to endorse, indorse
Sample sentence:Derived form: noun cosigner2
Somebody ----s something