Definition of down noun from the Oxford Advanced American Dictionary

     

    down

     noun
    noun
    NAmE//daʊn//
     
     
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  1. 1[uncountable] the very fine, soft feathers of a bird duck/goose down
  2. 2[uncountable] fine, soft hair see also downy
  3. 3[countable] (in football) one of a series of four chances to carry the ball forward ten yards that a team is allowed. These series continue until the team loses the ball or fails to go forward ten yards in four downs.
  4. Idioms
    ups and downs
     
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    the mixture of good and bad things in life or in a particular situation or relationship Every business has its ups and downs.
See the Oxford Advanced Learner's Dictionary entry: down