arm

Either of the two upper limbs of the human body, extending from the shoulder to the hand.

• She held the sleeping child in her arms. — This describes a common affectionate use of the noun.
• He broke his arm falling off his bicycle. — This is a direct example of an injury to the limb.

To supply or equip with weapons, or to provide with means of defense or offense.

• The police were ordered to arm themselves before entering the building. — This example shows the act of equipping oneself with weapons.
• The country decided to arm its civilian defense forces against potential invasion. — This illustrates providing weapons to a group for defense.