Out of the Blue definitions

Out of the blue

1) Apparently from nowhere 2) Slang for unexpectedly 3) Suddenly 4) Unexpectedly
Found on https://www.crosswordclues.com/clue/out-of-the-blue

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Out of the Blue

(from the article `Performing Arts`) ...low-budget cinema scored a triumph in Em4Jay (Alkinos Tsilimidos), a film sharp-witted enough to find new life in the old story of urban losers ...
Found on http://www.britannica.com/eb/a-z/o/40

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Out Of The Blue

Out of the blue is slang for unexpectedly.
Found on http://www.probertencyclopaedia.com/browse/ZO.HTM

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out of the blue

adverb in a way that was not expected; `her brother showed up at the wedding out of the blue`
Found on https://www.encyclo.co.uk/local/20974

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