if somethings slides on something else then that something is moving against that something else
spreading_stuff_onto_surface is not applying_stuff_to_surface. slide is not plaything. trying_to_steal_information is not unnatural_thing. moving_things is not_at_rest. slide is not motion. spreading_stuff_onto_surface is spreading. spreading_stuff_onto_surface is not spreading. moving_things is not not_at_rest.