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English definition of “join up”

join up

UK phrasal verb with join     /dʒɔɪn/ verb
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."Joining or leaving the army
(Definition of join up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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