out of the blue
C1 If something happens out of the blue, it is completely unexpected:
One day, out of the blue, she announced that she was leaving.
Thesaurus: synonyms and related words
Not expected or planned
- ad hoc
- ad hocism
- ad hockery
- ad lib
- ad-lib
- adventitious
- against (all) the odds/against all odds idiom
- explosive
- involuntary
- it's just one of those things idiom
- just like that idiom
- make sth up as you go along idiom
- muddle
- rude
- spur
- unawares
- undreamed of
- unexpected
- unforeseen
- unintended
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