Origin: French suffix -age
Frottage has 3 different meanings across 1 category:
masturbation by rubbing against another person (as in a crowd)
A method of making an image by placing a piece of paper against an object and then rubbing over it, usually with a pencil or charcoal.
To rub, especially to rub onto one surface placed upon another surface that is textured, in order to create a mottled or patterned area on the first surface.