join
/ˈjȯin/
verb
to put or bring together so as to form a unit
to connect (separated items, such as points) by a line
to put or bring into close association or relationship
join two blocks of wood with glue
noun
something that joins two things : a place or line where joining occurs : joint
union
the join of lid and box
idiom
to begin fighting : to engage in battle
troops joining battle against a hated enemy