Advanced English dictionary
1 the amount that a person measures around the waist, used to talk about how fat or thin they are: an expanding waistline + All this butter and cream won't do much for my waistline.
2 the place on a piece of clothing where your waist is
1 measurement of the body around the waist
VERB + WAISTLINE
Low-fat foods are ideal for people who are watching their waistline.
2 part of a piece of clothing