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English definition of “join up”

join up

UK
verb uk phrasal verb with join   /dʒɔɪn/ us  
If you join up, you become a member of one of the armed forces: "Have you been in the army for a long time?" "I joined up as soon as I'd left school."
(Definition of join up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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