WordWeb Online

1. (of fabrics and paper) grown dark in colour over time
   "the darkened margins of the paper"
    
2. Become or made dark by lack of light
   "a darkened house"; "the darkened theatre"

1. Become dark or darker
   "The sky darkened"
    
2. Tarnish or stain
   "a scandal that darkened the family's good name"
    
3. Make dark or darker
   "darken a room"

See also: dark, old

Type of: alter, change, defile, maculate [literary], modify, soil, stain, sully, tarnish

Antonym: lighten

Encyclopedia: Darken, Eric