Question 1

What does "arm up" mean?

Accepted Answer

To acquire or distribute weapons in preparation for conflict.

Question 2

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

Accepted Answer

Both sides began arming up in response to the rising border tensions.

Question 3

Is "arm up" formal or informal?

Accepted Answer

"arm up" is informal — used mainly in casual conversation. Used both literally (acquiring weapons) and figuratively (preparing for conflict or competition). Common in news reporting on conflicts. The reflexive sense ('arm themselves up') is also seen.

arm up

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