co-sign

Verb co-sign has 2 senses

• co-sign(v = verb.social) cosign - sign jointly; "Husband and wife co-signed the lease"
is one way to formalise, formalize, validate
Sample sentences:
Somebody ----s
Somebody ----s something

• co-sign(v = verb.communication) cosign - sign and endorse (another person's signature), as for a loan;
is one way to endorse, indorse
Sample sentence:
Somebody ----s something