A belt is an accessory you wear around your waist that helps hold your pants up. Other types of belts can hold tools or weapons.
Most belts are made of leather and buckle at the front of the waist. Tool belts have loops for keeping hammers and screwdrivers handy, and a seat belt fastens across your waist and shoulders to keep you safe in a moving car. If you belt someone, it takes on a different meaning: to hit hard. The Latin root is balteus, "girdle or sword belt," and the original definition of the verb was "to hit with a belt."