As a Noun: 1. A public meeting or march which is held by people to show their opposition to something or their support for it. English = demonstration, protest. 2. A group of people, usually trade union members, who stand outside a place of work in order to protest about something, to prevent people from going in, or to persuade the workers to join a strike. English = picket. 3. A large notice that is carried in a march or demonstration or is displayed in a public place. English = placard. As a Verb or Adjective: 1. To take part in a march or a meeting to show your opposition to something or your support for it. English = demonstrate, protest. 2. Of a group of people, usually trade union members, to stand outside a place of work in order to protest about something, to prevent people from going in, or to persuade the workers to join a strike. English = picket. 3. To hold a placard.