/ˈdɑːrkənɪŋ/
VERB
To reduce the amount of light in a place or make something less illuminated.
Making a room, area, or space darker by reducing the amount of light.
The gradual loss of daylight or the appearance of darkness caused by evening or clouds.
Changing the appearance of something by making its color darker or less bright.
Causing a person's mood, feelings, or an atmosphere to become sad, gloomy, or less hopeful.
Making something difficult to see, understand, or recognize by covering, clouding, or obscuring it.
Making something morally or figuratively worse by damaging its reputation, purity, or condition.
NOUN
The gradual process in which something becomes darker or loses brightness.
The process of a place, object, or the sky becoming darker as illumination decreases.