› [T] to connect or fasten two or more things together: join sth to sth Small screws are used to join the front panel to the sides.join sth together The pieces are joined together with glue. › [I or T] to become a member of a club, etc., or to start working for a company or an organization: Have you joined the pension plan? I joined the company immediately after college. › [I or T] to get involved in an activity with another person or group: join sb for sth Will you join us for dinner?join sb in doing sth I'm sure everyone will join me in wishing James a very happy retirement. › [I or T] TRANSPORT to get on a bus, train, or plane: Passengers who joined at Manchester should have their tickets ready for inspection.
join the dots › to connect two things or ideas in order to produce something new, or to show the relationship between different things: We need to join the dots between our current products and the needs of this new market.
join forces › to act with somebody else in order to do something: The two companies have joined forces to make the Web applications available to a wider public.