1. Becoming dark or darker as from waning light or clouding over
   "the darkening sky"

1. Changing to a darker colour
   - blackening

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"

Derived forms: darkenings

See also: dark

Type of: alter, change, change of color [US], change of colour [Brit, Cdn], defile, maculate, modify, stain, sully, tarnish

Antonym: brighten, lighten

Encyclopedia: Darken

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