1. make or become dark or darker: "the sky was darkening rapidly"Similargrow dark/darkerblackengrow black/blackerdimgrow dimcloud overlourmake dark/darkerblackenmake black/blackermake dimshadeeclipsefogobscureOppositelighten
2. make or become gloomy, angry, or unhappy: "his mood darkened"Similarmake/become gloomymake/become angrymake/become unhappymake/become annoyedmake/become depressedcast downbecome cast downdejectbecome dejectedweigh downoppressdampen the spirits ofmake/become dispiritedmake/become troubledcast a pall overblackenlook blacksaddenspoilmardetract from
▪ (of someone's eyes or expression) show anger or another strong negative emotion: "his face darkened and he lunged away"
▪ (of anger or another strong negative emotion) show in (someone's eyes or expression):"misery darkened her gaze"