Meaning of trade unionize in English:

trade unionize

Pronunciation /ˌtreɪd ˈjuːnɪənʌɪz/

verb

(also trade unionise)
British
  • 1 rare To join or form a trade union; to become unionized; = "unionize".

  • 2To cause to become members of a trade union; to bring under trade union rules or organization.

Origin

Late 19th century. From trade union + -ize.