out of the blue

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Definitions

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