Definition of first down noun from the Oxford Advanced Learner's Dictionary

     

    first down

     noun
    noun
    BrE
     
    ; NAmE
     
    (in American football) American football
     
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  1. 1the first of a series of four downs (= chances to move the ball forward ten yards) See related entries: American football
  2. 2the chance to start a new series of four downs because your team has succeeded in going forward ten yards
See the Oxford Advanced American Dictionary entry: first down