The Collaborative International Dictionary of English v.0.48:

Sandpaper \Sand"pa`per\, n.
   Paper covered on one side with sand glued fast, -- used for
   smoothing and polishing.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sandpaper \Sand"pa`per\, v. t.
   To smooth or polish with sandpaper; as, to sandpaper a door.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sandpaper
    n 1: stiff paper coated with powdered emery or sand [syn: emery
         paper, sandpaper]
    v 1: rub with sandpaper; "sandpaper the wooden surface" [syn:
         sandpaper, sand]