What is the meaning of darkened?

verb

• Become dark or darker.
  • usage: "The sky darkened"
  • synonyms: darken
• Tarnish or stain.
  • usage: "a scandal that darkened the family's good name"
  • synonyms: darken
• Make dark or darker.
  • usage: "darken a room"
  • synonyms: darken

adjective

• Of fabrics and paper. ( grown dark in color over time)
  • usage: "the darkened margins of the paper"
• Become or made dark by lack of light.
  • usage: "a darkened house"; "the darkened theater"