Definition of bullpen noun from the Oxford Advanced American Dictionary

     

    bullpen

     noun
    noun
    NAmE//ˈbʊlpɛn//
     
     
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  1. 1 the part of a baseball field where players practice pitching (= throwing)
  2. 2 extra pitchers (= players who throw the ball) in a baseball team who are used, if necessary, to replace the usual pitchers The team's bullpen is solid this year.
  3. 3a type of large office which is open-plan (= it does not have walls dividing the office area)
  4. 4a room where prisoners wait before they go into the court for their trial
See the Oxford Advanced Learner's Dictionary entry: bullpen