arm in WordNet English dictionary

1. the part of a garment that is attached at the armhole and that provides a cloth covering for the arm
   sleeve  arm 
   
2. any instrument or instrumentality used in fighting or hunting
   "he was licensed to carry a weapon"
   weapon  arm  weapon system 
   
3. the part of an armchair or sofa that supports the elbow and forearm of a seated person
   arm 
   
4. any projection that is thought to resemble a human arm
   "the arm of the record player"; "an arm of the sea"; "a branch of the sewer"
   arm  branch  limb 
   
5. 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
   arm 
   
6. a division of some larger or more complex organization
   "a branch of Congress"; "botany is a branch of biology"; "the Germanic branch of Indo-European languages"
   branch  subdivision  arm 
   

1. prepare oneself for a military confrontation
   "The U.S. is girding for a conflict in the Middle East"; "troops are building up on the Iraqi border"
   arm  build up  fortify  gird 
   
2. supply with arms
   "The U.S. armed the freedom fighters in Afghanistan"
   arm