joiner
noun [ C ] uk/ˈdʒɔɪ.nər/ us/ˈdʒɔɪ.nɚ/
(WOOD WORKER)
木匠，木工
a skilled worker who makes the wooden structures inside buildings, such as doors and window frames
(TAKING PART)
参与者；加入者
someone who agrees to take part in an arrangement or become a member of an organization
Recent joiners are in a worse position than existing members. 最近的加入者比现有会员的处境要糟糕。
informal社团活跃分子
a person who likes to get involved in activities with groups of people
I don't think you'll persuade David to come along to tonight's meeting - he's not much of a joiner. 我认为你不可能说服大卫来参加今晚的会议——他可不是社团活跃分子。