Definition of warning noun from the Oxford Advanced American Dictionary

      

    warning

     noun
    noun
    NAmE//ˈwɔrnɪŋ//
     
     
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  1. 1 [countable, uncountable] a statement, an event, etc. telling someone that something bad or unpleasant may happen in the future so that they can try to avoid it Doctors issued a warning against eating any fish caught in the river. to give someone fair/advance/adequate warning of something The bridge collapsed without (any) warning. Let me give you a word of warning. Many people continue to ignore warnings about the dangers of sunbathing. The union failed to heed warnings that strike action would lead to the closure of the factory. see also early warning
  2. 2[countable] a statement telling someone that they will be punished if they continue to behave in a particular way synonym caution to give someone a verbal/written/final warning
warningadjective[only before noun]
 
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She had ignored the warning signs of trouble ahead. Police fired a number of warning shots. Warning bells began to ring (= it was a sign that something was wrong) when her letters were returned unopened.