adjective
Definition: Physically fit and muscular, often as a result of exercise or bodybuilding; also refers to a light yellowish-brown color.
Example: He looked buff after months of working out at the gym.
noun
Definition: A type of soft leather made from the skins of animals, often used for clothing or polishing, or a term used informally to refer to being naked.
Example: He polished the car with a buff to make it shine.
transitive verb
Definition: To polish or shine something, often using a soft cloth or material.
Example: He used a soft cloth to buff the car until it shone.