Out of the Blue (2008 TV series)
WordNet

adverb


(1)   In a way that was not expected
"Her brother showed up at the wedding out of the blue"
WiktionaryText

Adverb


out of the blue
  1. unexpectedly; without warning or preparation
    After I hadn’t heard from her in six months, she called me out of the blue to meet for lunch.
    I really can't understand how something like this could simply pop up out of the blue.
 
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