Something unexpected happens suddenly.
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Happening with no warning at all.
When something comes out of the blue, it surprises everyone.
People use it for news, messages, or decisions that nobody saw coming.
"Out of Nowhere"
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Appearing or happening very suddenly, often with a sense of physical immediacy
"All of a Sudden"
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Something happening quickly and unexpectedly, often marking a shift in a situation
"Out of the Blue"
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Something happening completely without warning or any prior indication