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This is a term that started by describing weather. The bold in this sentence is a bold of lighting. Sometimes a bolt of lightning will strike suddenly without any storm clouds nearby. This is the original meaning of a bolt from the blue, as in a lightning bolt out of the clear blue sky.

Now we use the term to mean anything that seems to come out of nowhere without warning. If you've been trying to come up with a good slogan for your class and nobody can think of one, for example. Everybody is sitting around drawing and discussing ideas. Suddenly one of your classmates jumps up and yells out the perfect slogan without any warning. You could say "Well that was a bolt out of the blue!"

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15y ago

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