Meaning of “join” - Learner’s Dictionary

join

verb uk us /dʒɔɪn/
BECOME MEMBER [ T ]

A2 to become a member of a group or organization:

He joined the army when he was eighteen.
DO WITH OTHERS [ T ]

A2 to do something or go somewhere with someone:

Would you like to join us for dinner?
FASTEN [ T ]

B1 to fasten or connect things together:

Join the ends together with strong glue.
A suspension bridge joins the two islands.
MEET [ I, T ]

B1 to meet at a particular point:

The Mississippi River and the Missouri join near St Louis.
join a line (also UK join a queue)

to go and stand at the end of a row of people waiting for something

→ See also join forces

(Definition of “join verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)