[] a person or group of people who stand outside the entrance to a building in order to protest about sth, especially in order to stop people from entering a factory, etc. during a strike; an occasion when this happens （罢工期间）纠察员，纠察队◆Five pickets were arrested by police. 五名纠察员被警方逮捕了。◆I was on picket duty at the time. 当时我担任罢工纠察。◆a mass picket of the factory 工厂的群众纠察队