Definition of a bolt from or out of the blue in English:

a bolt from (or out of) the blue

A sudden and unexpected event: the job came like a bolt from the blue
[with reference to the unlikelihood of a thunderbolt coming from a clear blue sky]
More example sentences
  • To much of the global community, the events of November 1938 came like a bolt out of the blue.
  • This accusation about Nicky has come like a bolt out of the blue.
  • It would be an understatement to say that it was a bolt out of the blue.
Synonyms
shock, surprise, bombshell, jolt, thunderbolt, revelation, source of amazement
informal turn-up for the books, shocker, whammy
See parent entry: bolt

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Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
adjective
turned backwards