Definitions

1. verb

to make or become less bright or to make something darker

“The clouds began to darken the sky.”

2. verb

to become or make something less cheerful or more gloomy

“The news darkened his mood.”

3. verb

to make something less intense or less extreme

“The storm is expected to darken by nightfall.”

4. noun

the act of becoming or making something less bright

“The darken of the room was sudden.”

5. noun

a state of being less bright or cheerful

“The darken of his mood was evident.”