waist
noun
"Waist" is a part of the human body located in the center of the torso, between the stomach and hips. It is often referred to as the narrowest part of the midsection.
Example
- I need to buy a new dress that fits my waist properly.
- The waist is often the first area to accumulate fat when people gain weight.
- The dancer moved her waist in time with the music.