To sign on the opposite side of (a document).
To add a second signature to a document, affirming the validity of the signature of another person.
A second signature added to a document to affirm the validity of the signature of the first person.
The response to a sign or signal.
To sign; to put one's name to.
To support, lend support to, guarantee the basis of.
To agree to pay by signing one's name; subscribe.
Specifically, to assume financial responsibility for something, and guarantee it against failure.
To act as an underwriter.
To write below or under; subscribe.