Keywords: dark, darkness, darken
As a Noun
The lack of light in a place. English = dark, darkness.
As a Verb or Adjective
Of a place or the sky, to become darker, for example because it is nearly night. English = darken.
Of a place or situation, to lack light and to be difficult to see in. English = (be) dark.
Of a thing, to be or have the colour that is quite near black. English = (be) dark.