We've had the Dior padded hips and bosoms, bustles for big bums, roll-ons for flat bums, and who remembers Sabrina in the 50s? She had to be hour-glass shape.
Applied by means of a ball that can be rotated to pick up liquid from the inner reservoir
a woman's foundation garment rolled on to the hips a dispenser of a liquid cosmetic (such as a deodorant) having a revolving ball as an applicator
A roll-on is a deodorant or cosmetic that you apply to your body using a container with a ball which turns round in the neck of the container. I use unperfumed roll-on deodorant. a bottle which contains liquid that you rub under your arms in order to stop your sweat from smelling unpleasant
a dispenser of a liquid cosmetic (such as a deodorant) having a revolving ball as an applicator