One entry found for darken.

Entry Word: darken
Function: verb
Text: 1 to take on a gloomy or forbidding look <his face slowly darkened as we told him the sad news>
Synonyms gloom, glower, lower (also lour)
Related Words frown, scowl; glare, stare; brood, mope, pout, sulk; anger, fume, rage, steam; intimidate, menace, threaten
Antonyms brighten, cheer (up), lighten, perk (up)
2 to make dark, dim, or indistinct <years of accumulated grime have darkened the painting until it can barely be seen> -- see CLOUD 1