Definition of trade unionize in English:

trade unionize

(also trades unionize, trade unionise, trades unionise)

verb

British
  • 1no object To join or form a trade union; to become unionized; = "unionize". Now rare.

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

Origin

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

Pronunciation

trade unionize

/ˌtreɪd ˈjuːnɪənʌɪz/