verb (v)

• make smooth or smoother, as if by rubbing(verb.contact)

  Synonym:
  smooth
  Antonym:
  roughen
  

  source: wordnet30
• make (a surface) shine(verb.contact)

  Synonym:
  polish, shine, smooth
  

  source: wordnet30
• become smooth(verb.change)

  source: wordnet30
• To make smooth.(verb)

  source: webster1913