strong paper coated with a layer of sand or other abrasive, used for smoothing or polishing.
verb (used with object)
to smooth or polish with or as if with sandpaper.

1815–25; sand + paper Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sandpaper (ˈsændˌpeɪpə)
1.  (formerly) a strong paper coated with sand for smoothing and polishing
2.  a common name for glasspaper
3.  (tr) to polish or grind (a surface) with or as if with sandpaper

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Ancient forms of tattoo removal included primitive dermabrasion-scraping the
  skin with rough surfaces, such as sandpaper.
Make a similar ramp using a plank covered with sandpaper, oil or aluminum foil.
Both patients could tell the difference between different grades of sandpaper
  rubbed against their skin.
The process is akin to using extremely fine-grained sandpaper as a sharpener.
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