bull·pen
 /ˈbʊlˌpɛn/  noun  ,  pl   ⋯ pens [  count  ]
  1 : a place on a baseball field where pitchers practice throwing the ball before they start pitching in a game
   A relief pitcher is warming up in the bullpen.
  2 : the pitchers on a baseball team who can replace another pitcher during a game
   The team has a strong bullpen.