DARKEN
- to make dark [v DARKENED, DARKENING, DARKENS]
- to grow dark become obscured the skies were darkening
- become gloomy his mood darkened
- make dark
- to make dark (having little light) [v -ED, -ING, -S]
- make less clear obscure the financial crisis darkened the future of the company
- cast a gloom over
- make of darker color