Meaning of “join up” in the English Dictionary

british dictionary

"join up" in British English

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(Definition of “join up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"join up" in American English

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join up

phrasal verb with join us /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)