to join up

listen to the pronunciation of to join up
English - English
To enlist or enroll
If someone joins up, they become a member of the army, the navy, or the air force. When hostilities broke out he returned to England and joined up. = enlist
If one person or organization joins up with another, they start doing something together. Councils are joining up with their European counterparts They began to join up in communities. = get together, link up
join the army
to join up
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