Question 1

What does "join up" mean?

Accepted Answer

To enlist in the military or join an organization as a full member.

Question 2

How do you use "join up" in a sentence?

Accepted Answer

My grandfather joined up at the age of eighteen and served in the navy.

Question 3

Is "join up" formal or informal?

Accepted Answer

"join up" is register-neutral — appropriate in both casual and formal contexts. The military sense is historically common in British English ('he joined up in 1939'). The connecting sense is common in both British and American English. Also used figuratively for people or organizations coming together.

join up

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