{f} make dark; dim; grow dark; obscure; make blind; become blind; tarnish, stain; make sad or gloomy; become angry or unhappy
make dark or darker; "darken a room" become dark or darker; "The sky darkened" tarnish or stain; "a scandal that darkened the family's good name" become or make darker; "The screen darkend"; "He darkened the colors by adding brown
If someone's face darkens, they suddenly look angry. Rawley's face darkened again
If something darkens or if a person or thing darkens it, it becomes darker. The sky darkened abruptly She had put on her make-up and darkened her eyelashes. lighten
If someone's mood darkens or if something darkens their mood, they suddenly become rather unhappy. My sunny mood suddenly darkened Nothing was going to darken his mood today