noun
Either of a pair of people or things that belong together.
Someone who is associated with another in a common activity or interest.
(nautical) One of the pieces of wood comprising the framework which strengthens the deck of a wooden ship around the holes through which the mast and other fittings pass.
(Jamaica) A group financial arrangement in which each member contributes a set amount of money over a set period.
verb
(transitive) To join as a partner.
(intransitive, often with with) To work or perform as a partner.