noun
A statement or event that indicates a possible danger, problem, or other unpleasant situation
verb
To inform someone in advance of a possible danger, problem, or other unpleasant situation
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The weather service issued a warning for potential flooding in the area.
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Hey, just a heads up, there's a warning about heavy traffic on the highway.
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Dude, I got a warning from my boss for being late again.
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She ignored all the warning signs that he was not the right person for her.