join

join /ˈʤoɪn/ verb
joins; joined; joining
join
/ˈʤoɪn/
verb
joins; joined; joining
Britannica Dictionary definition of JOIN
1 
a  [+ object] : to put or bring (two or more things) together
: to connect (two or more things)
b  : to come together with (something)
[+ object]
[no object]
— often + up
2 
a  [+ object] : to go somewhere in order to be with (a person or group)
b  : to do something with (a person or group)
[+ object]
[no object]
c  : to become involved in or part of (something, such as an activity)
[+ object]
[no object]
— + in
3 
: to become a member of (a group or organization)
[+ object]
[no object]
— often + up

if you can't beat them, join them

— see 1beat

join battle

formal
: to begin fighting : to engage in battle

join forces

— see 1force

join hands

: to hold the hand of another person
— often used figuratively

join (someone) in marriage/matrimony

formal
: to marry (someone)

join the club

— see 1club

join the crowd

— see 2crowd

join up

[phrasal verb]
: to meet each other at a particular place