Darken/ˈdɑːrkən/ Definition 1 of 3Pro Tip 1/3Atmospheric Changes Use 'darken' to talk about changes in lighting due to weather or time of day. Clouds gathering at dusk will darken the streets. Pro Tip 2/3Electronic Screens Refer to diminishing brightness of screens or displays with 'darken'. Darken your phone screen to save battery. Pro Tip 3/3Temporary State Use 'darken' to describe something becoming dark that could later brighten. The room will darken as the movie starts.