1. to become dark or darker
Usage: intransitive
2. to make something dark or darker
Usage: transitive
3. to become gloomy or troubled in mood or expression
Usage: figurative

Examples

• The sky darkens before a storm.
• She darkens her eyebrows with makeup.
• The room darkens as the sun sets.
• His face darkens when he hears bad news.
• The photographer darkens the image in post-processing.
• Her mood darkens whenever work is mentioned.
• The forest darkens as we walk deeper into it.