verb
joins; joined; joining
[+ obj] :to put or bring (two or more things) together
to come together with (something) [+ obj]
[+ obj] :to go somewhere in order to be with (a person or group)
to do something with (a person or group) [+ obj]
to become involved in or part of (something, such as an activity) [+ obj]
+ in
to become a member of (a group or organization) [+ obj]
if you can't beat them, join them
join battle
formal :to begin fighting :to engage in battle
join forces
join hands
to hold the hand of another person
join (someone) in marriage/matrimony
formal :to marry (someone)
join the club
join the crowd
join up
[phrasal verb]
to meet each other at a particular place
US