Definition of running noun from the Oxford Advanced American Dictionary

      

    running

     noun
    noun
    NAmE//ˈrʌnɪŋ//
     
    [uncountable]
     
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  1. 1the action or sport of running to go running running shoes
  2. 2the activity of managing or operating something the day-to-day running of a business the running costs of a car (= for example of fuel, repairs, insurance)
  3. 3-running (in compounds) the activity of bringing something such as drugs, guns, etc. into a country secretly and illegally drug-running
  4. Idioms
    in/out of the running (for something)(informal)
     
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    having some/no chance of succeeding or achieving something
See the Oxford Advanced Learner's Dictionary entry: running