Out of the blue

//aʊt ɒv ðə bluː// prep_phrase

Definitions

Adjective
  1. 1
    not anticipated wordnet
Adverb
  1. 1
    in a way that was not expected wordnet
Prep_phrase
  1. 1
    Unexpectedly; without warning or preparation. idiomatic

    "After I hadn’t heard from her in six months, she called me out of the blue to meet for lunch."

Etymology

Short for out of the blue sky, likening an unexpected event to lightning or rain coming suddenly from a cloudless sky.

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