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warning

noun [C or U]
 
 
/ˈwɔː.nɪŋ/ US  /ˈwɔːr-/

Definition

B1 something that makes you understand there is a possible danger or problem, especially one in the future: Completely without warning he turned up on my doorstep with all four children! There's a warning on the cigarette packet that says 'Tobacco seriously damages health'. I'm not surprised you feel ill - let it be a warning to you! Just a word of warning - restaurants in this area can be very expensive.formal The government have today issued a warning about the dangers of sunbathing. They can't dismiss you just like that - they have to give you a written warning first. The police fired warning shots but the protesters took no notice.Threats and warnings warning sign a physical condition that shows someone has a disease: The warning signs of the illness are respiratory problems and dizziness.Threats and warnings
(Definition of warning noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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