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English definition of “join up”

join up

phrasal verb with join    /dʒɔɪn/ verb [I/T]
to become a member of the military or another group: Levi was not the first member of his family to join up – his sister was already in the Navy. Save the Seagulls is looking for volunteers to join up.
(Definition of join up from the Cambridge Academic Content Dictionary © Cambridge University Press)
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