The phrase ‘(A) bolt from the blue' indicates an utterly unexpected blow or disaster. When the sky is blue we do not usually expect a thunderstorm; hence the usage.
Sample Usage
1.The news of her uncle's death came to her as a bolt from the blue.
2.When I came to know of your failure in the examination, it was like a bolt from the blue for me.
3.The news of his mother's sudden demise came to him as a bolt from the blue.
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