roll-on

1. not comparableusuallyApplied by means of a ball that can be rotated to pick up liquid from the inner reservoir.

plural roll-ons

1. datedin pluraloftenA type of corset which is rolled on to the body.

   Roll-ons and lastex^([sic]) corsets in tube form were a lighter type of corset mostly worn by young women and under summer clothes.

   1997, Marianne Thesander, The Feminine Ideal, page 139

   1 more example

   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.

   2007 November 6, Michele Hanson, The Guardian

2. A cosmetic product (especially a deodorant) applied by means of a ball at the head of a container, which rolls the product on to the skin etc.

   I never minded aerosols. But in the interests of the environment, I changed to roll-ons.

   1999 July 16, Laura Craik, The Guardian