sandpaper
sand‧pa‧per1 /ˈsændˌpeɪpə $ -ər/ 
noun [uncountable]
strong paper covered on one side with sand or a similar substance, used for rubbing wood in order to make the surface smooth
sandpaper2 verb [transitive]
to rub something with sandpaper
| I |
noun [uncountable]strong paper covered on one side with sand or a similar substance, used for rubbing wood in order to make the surface smooth
| II |
verb [transitive]to rub something with sandpaper