What Does "Arm Up" Mean?
"Arm up" is an English idiom. It means "to equip oneself with weapons."Examples in Sentences
Here are three examples of the idiom "arm up" used in a sentence:- Before the mission, they armed up and went through the plan once more.
- The gang members armed up in preparation for a turf war.
- It's dangerous out there; we need to arm up.

What Is an Idiom?
An idiom is a commonly used expression whose meaning does not relate to the literal meaning of its words. In other words, if you were to translate "Arm Up" word for word, there is no guarantee the translation would help you to understand the meaning.An idiom often includes a cultural or historical context that makes it difficult for non-native English speakers to understand. A phrase is classified as an idiom when a direct translation of the words does not reveal the meaning. Most idioms rely on shared knowledge or experiences known only to a specific community.
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