Definition from macmillandictionary.com
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By law, cigarette packets must carry a health warning.
a warning against driving on the icy roads
a warning of severe thunderstorms
Investors had little advance warning of the stock market crash.
Suddenly, without warning, Mitch turned and hit Jacob in the face.
This is your last warning – if you’re late again, you’ll lose your job.
Police issued a warning to drivers that speed limits will be strictly enforced.