arm
UK: ɑːm | US: ɑːrm
n. 1. The upper limb of the human body, from the shoulder to the hand.
n. 2. A branch or division of an organization (e.g., "the political arm").
n. 3. Weapons collectively (e.g., "nuclear arms").
vt. To equip with weapons or tools (e.g., "arm the soldiers").
The word "arm" traces back to Old English "earm," meaning the upper limb of the body, derived from Proto-Germanic *armaz. Its dual meanings—physical limb and weaponry—stem from the concept of the arm as a tool for both labor and combat. The weapon sense evolved metaphorically, as arms (weapons) extend one's power, much like limbs extend physical capability.
She broke her arm while skiing.
The charity is the fundraising arm of the hospital.
The country spent billions on arms during the war.
The soldiers were armed with rifles.
He crossed his arms and waited impatiently.