picket line
noun [ C ] uk/ˈpɪk.ɪt ˌlaɪn/ us/ˈpɪk.ɪt ˌlaɪn/
纠察线
a group of workers acting as pickets
Journalists interviewed the union officials on the picket line. 记者们采访了纠察线里的工会干部。
The van drivers refused to cross the picket line (= to go past the pickets). 货车司机拒绝穿越纠察线。