Meaning of “waist” - Learner’s Dictionary

waist

noun [ C ] uk us /weɪst/
BODY

B2 the part around the middle of your body where you wear a belt:

She had a 26 inch waist.
CLOTHES

the part of a piece of clothing that fits round the waist

(Definition of “waist” from the Cambridge Learner’s Dictionary © Cambridge University Press)