English▸ verb
1 make or become dark or darker:
[no object] the sky was darkening rapidly
[with object] darken the eyebrows with black powder.
2 make or become gloomy, angry, or unhappy:
[no object] his mood darkened
[with object] the abuse darkened the rest of their lives.
▪ [no object] (of someone's eyes or expression) show anger or another strong negative emotion:
his face darkened and he lunged away.
▪ [with object] (of anger or another strong negative emotion) show in (someone's eyes or expression):
misery darkened her gaze.