definition of
arm

[1] #1 arm n. 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. wn

[2] #2 arm v. [build up, fortify, gird] 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". wn

[3] #3 arm n. [branch, limb] 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". wn

[4] #4 arm v. supply with arms; "The U.S. armed the freedom fighters in Afghanistan". wn

[5] #5 arm n. [weapon, weapon system] any instrument or instrumentality used in fighting or hunting; "he was licensed to carry a weapon". wn