Meaning

noun 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

verb prepare oneself for a military confrontation

noun weapons considered collectively

originFrom Middle English armes, from Old French armes, from Latin arma (“weapons”), from Proto-Indo-European *h₂er-mo-, a suffixed form of *h₂er- (“to fit together”), hence ultimately cognate with etymology 2.

Etymology from Wiktionary, CC BY-SA 3.0