waist (Noun) — The narrowing of the body between the ribs and hips. ex. "an ample waist"
waist (Noun) — The narrow part of the shoe connecting the heel and the wide part of the sole.
waist (Noun) — A part of a piece of clothing that covers the waist.
waist (Noun) — The narrow middle part of something.
waist (Noun) — The middle of a ship or the fuselage of an aircraft.