Synonyms of 'a bolt from the blue'
▷ See bolt
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(esp formerly) a bomb or artillery shell
His resignation after thirteen years is a political bombshell.
Jolt is also a noun.
The campaign came at a time when America needed such a jolt.
If you have a shock, something suddenly happens which is unpleasant, upsetting, or very surprising.
The extent of the violence came as a shock.
Thesaurus for a bolt from the blue from the Collins English Thesaurus
a sudden , unexpected , and usually unwelcome event