waist
Pronunciation: /weɪst/
noun
- 1the part of the human body below the ribs and above the hips, often narrower than the areas above and below: he put an arm around her waist the last time you had a waist was around 1978
- the circumference of a person’s waist: her waist has reduced from 35 to 28 inches
- the part of a garment around or covering the waist: trousers with an elasticated waist
- the point at which a garment is shaped so as to narrow between the ribcage and the hips: a jacket with a high waist

Origin:
late Middle English: apparently representing an Old English word from the Germanic root of wax2

Do not confuse waste with waist. Waste means 'use more of something than is necessary or useful' ( we can’t afford to waste electricity), whereas waist means 'the part of a person’s body between the ribs and the hips' ( he put his arm around her waist).