Darken
Definition 1 of 3
Pro Tip 1/3
Atmospheric 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 2/3
Electronic Screens
Refer to diminishing brightness of screens or displays with 'darken'. Darken your phone screen to save battery.
Pro Tip 3/3
Temporary State
Use 'darken' to describe something becoming dark that could later brighten. The room will darken as the movie starts.