Entry 2 senses · 2 variants Webster, 1913 Sandpaper /săn'-dpāpˌ-ẽr/ · Sand·pa·per · IPA /ˈsændˌpeɪpɚ/ n. v. t. 01 n. Paper covered on one side with sand glued fast, -- used for smoothing and polishing. 1. Paper covered on one side with sand glued fast, -- used for smoothing and polishing. 02 v. t. To smooth or polish with sandpaper; as, to sandpaper a door. 1. To smooth or polish with sandpaper; as, to sandpaper a door.