To add a second signature to a document, affirming the validity of the signature of another person.
To sign on the opposite side of (a document).
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 mark with one's signature as a token of consent or attestation.
To sign up to have copies of a publication, such as a newspaper or a magazine, delivered for a period of time.
To agree to buy shares in a company.
To pay money to be a member of an organization.
To contribute or promise to contribute money to a common fund.
To indicate interest in the communications made by a person or organization.
To believe or agree with a theory or an idea (used with to).
To pay for the provision of a service, such as Internet access or a cell phone plan.
To register for notifications about an event or similar.
To promise to give, by writing one's name with the amount.