Definitions from Wiktionary ( )

▸ verb:  (ergative) To sign up to have copies of a publication, such as a newspaper or a magazine, delivered for a period of time.
▸ verb:  To pay for the provision of a service, such as Internet access, a cell phone plan, or a streaming service.
▸ verb:  To believe or agree with a theory or an idea [with to].
▸ verb:  To pay money to be a member of an organization.
▸ verb:  (intransitive) To contribute or promise to contribute money to a common fund.
▸ verb:  (transitive) To promise to give, by writing one's name with the amount.
▸ verb:  (business and finance) To agree to buy shares in a company.
▸ verb:  (transitive) To sign; to mark with one's signature as a token of consent or attestation.
▸ verb:  (archaic outside law) To write (one’s name) at the bottom of a document; to sign (one's name).
▸ verb:  (obsolete) To sign away; to yield; to surrender.
▸ verb:  (obsolete) To yield; to admit to being inferior or in the wrong.
▸ verb:  (obsolete, transitive) To declare over one's signature; to publish.
▸ verb:  (intransitive) To indicate interest in the communications made by a person or organization.
▸ verb:  (intransitive, programming) To register for notifications about an event or similar.

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