Noun

1. A human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb
2. Any projection that is thought to resemble a human arm
3. Any instrument or instrumentality used in fighting or hunting
4. The part of an armchair or sofa that supports the elbow and forearm of a seated person
5. A division of some larger or more complex organization
6. The part of a garment that is attached at the armhole and that provides a cloth covering for the arm

Verb

1. Prepare oneself for a military confrontation
2. Supply with arms