trades union [经] 工会
trades union[ noun ]
an organization of employees formed to bargain with the employer
<noun.group>
you have to join the union in order to get a job
trades union \trades" un`ion\, or Trade union \Trade" un`ion\ .
An organized combination among workmen for the purpose of
maintaining their rights, privileges, and interests with
respect to wages, hours of labor, customs, etc.