Unionize (verb)

To form or join a labor union.

Origin:

The word "unionize" is derived from the word "union" which means the act or state of being united and -ize which means to form or make something into a particular type or form.

Examples:

1. The employees voted to unionize and join the United Auto Workers.
2. He led the effort to unionize the factory workers.
3. The company fought the workers' efforts to unionize.
4. The workers decided to unionize in order to improve their wages and working conditions.
5. The government passed a law allowing the workers to unionize.