American English

Definition of join up phrasal verb from the Oxford Advanced American Dictionary

 

join up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to become a member of the armed forces synonym enlist Her grandfather joined up in 1914.

join up (with somebody)

 
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to combine with someone else to do something We'll join up with the other groups later.
See the Oxford Advanced Learner's Dictionary entry: join up