darken
/ˈdɑrkən/
verb
- To become darker or to make something darker in color or shade.
- The sky began to darken as the storm approached.
- You can darken the photo by adjusting the brightness settings.
- The wood will darken over time if it is exposed to sunlight.
- To make something less cheerful or more serious; to become gloomy or sad.
- His expression darkened when he heard the disappointing results.
- The bad news seemed to darken everyone's mood at the party.
- The argument threatened to darken the otherwise pleasant evening.