volunteer² n [C] 1 someone who does work without being paid 义务工作者，义工: The helplines are manned by volunteers. 救助热线是由义务工作者接听的。 2 someone who offers to do something without being told that they must do it 自愿参加者: I need someone to help me with the barbecue. Any volunteers? 我需要几个人来帮我弄烧烤野餐，有谁愿意吗？