English to English

verb (v)

• make darker and difficult to perceive by sight(verb.change)

  Synonym:
  benight
  

  source: wordnet30
• make obscure or unclear(verb.change)

  Synonym:
  obfuscate, obscure, overcloud
  

  source: wordnet30
• To make dim; to obscure or darken.(verb)

  source: webster1913