a skilled worker who makes the wooden structures inside buildings, such as doors and window frames

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。

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。