out of the blue

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• March 23. 2016 from wordnet.princeton.edu

  out of the blue — adverb — english

  in a way that was not expected; "her brother showed up at the wedding out of the blue"

• March 30. 2016 from wordnet.princeton.edu

  out of the blue — adjective — english

  not anticipated; "unanticipated and disconcerting lines of development"- H.W.Glidden; "unforeseen circumstances"; "a virtue unlooked-for in people so full of energy"; "like a bolt out of the blue"; "unseen problems"