noun
waist
WAYST/weɪst/
The area around the middle of the body just above the hips.
His hands rest at his waist above the hips.

Etymology
Its origin is uncertain. A proposed connection with words for growth would explain the body's middle as “where the body grows,” but this ancestry is not established.
In context
which goes from 29 and 1/2 to 44 for the bust, and 22 That's the waist, which I guess is still very important since this the waist is the only part that's fitted.
More examples
- He measured his waist before buying trousers.
- The jacket narrows at the waist.
- Water rose to their waists.
Forms
waist · waists
waistband noun — the band around the waist of clothing
Similar words
- midsection
- The middle body region more broadly.
- midriff
- The area between chest and waist.