Also found in: Thesaurus, Idioms.
v. dark·ened, dark·en·ing, dark·ens
a. To make dark or darker.
b. To give a darker hue to.
2. To fill with sadness; make gloomy.
3. To render vague or uncertain; obscure: The sudden drop in stock prices darkened the future for investors.
4. To tarnish or stain: a scandal that darkened the family's good name.
To become dark or darker.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.