What part of speech is arm?

"Arm" can be several parts of speech depending on how it's used in a sentence:

* Noun: This is the most common usage, referring to the limb of a human or animal.

* Example: "She broke her arm in the accident."

* Verb: It can mean to provide with weapons or equipment.

* Example: "The soldiers were armed with rifles."

* Verb: It can also mean to equip or prepare oneself for something.

* Example: "We armed ourselves with flashlights and maps."

So, to determine the part of speech, you need to look at how "arm" is used in the specific sentence.