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join up

phrasal verb
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join up
  1. to become a member of the armed forces入伍；参军 synonym enlist
    • Her grandfather joined up in 1914.她的祖父于1914年加入。
join up (with somebody)
  1. to combine with somebody else to do something（与某人）联合，会合
    • We'll join up with the other groups later.我们以后再与其他小组会合。🔊🔊