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frot·tage
/frôˈtäZH/
noun: frottage
1.
ART
the technique or process of taking a rubbing from an uneven surface to form the basis of a work of art.
a work of art produced by taking a rubbing from an uneven surface.
plural noun: frottages
2.
the practice of touching or rubbing against the clothed body of another person in a crowd as a means of obtaining sexual gratification.
Origin
1930s: French, ‘rubbing, friction’, from frotter ‘to rub’, of unknown origin.