1. (

• blackening ,
• darkening

) changing to a darker color ;

1. (

• darken

) become dark or darker; "The sky darkened" ;

2. (

• darken

) tarnish or stain; "a scandal that darkened the family's good name" ;

3. (

• darken ,

) make dark or darker; "darken a room" ;

1. (

• darkening

) becoming dark or darker as from waning light or clouding over; "the darkening sky" ;