it is a complete and sudden surprise
utterly abrupt that surprises one very much
something crucial or unusual that happens suddenly or unexpectedly
The prime minister's resignation was a bolt from the blue.
The referendum acted as a bolt from the blue that the life of many people.
It was a real bolt from the blue when I bumped into my first ever boyfriend in the supermarket.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.