WordWeb Online

1. Make smooth or smoother, as if by rubbing
   "smoothen the surface of the wood";
   - smooth
    
2. Make (a surface) shiny
   - polish, smooth, shine
    
3. Become smooth

Derived forms: smoothens, smoothening, smoothened

See also: slur over

Type of: beautify, change, change surface, embellish, fancify, prettify

Antonym: roughen