1.  unionize(v = verb.social) unionise - recruit for a union or organize into a union; "We don't allow people to come into our plant and try to unionize the workers"
is one way to enrol, enroll, enter, inscribe, recruit
Derived forms noun union₁, noun unionization₁
Sample sentences: Somebody ----s somebody

2.  unionize(v = verb.social) organise, organize, unionise - form or join a union; "The auto workers decided to unionize"
is one way to fall in, get together, join
Derived forms noun union₁, noun unionization₁
Sample sentences: Somebody ----s

unionize, v.tr. & intr. (also -ise) bring or come under trade-union organization or rules.

Derivative:
unionization n.