The term “bullpen” has been used in baseball since the sport really took hold around the late 1800s.
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Did PETA Ask MLB to Rename Bullpen 'Arm Barn'?
PETA says baseball world should stop using bullpen in favor of animal-friendly arm barn - CBS Los Angeles
Credit to Rangers, but fans deserve better than World Series bullpen games
Tyler Kroll (@tkrollski) / X
PETA strikes out with suggestion that MLB drop 'bullpen
Author: Davy Andrews
Bullpen Dictionary: Bullpen. The world of baseball has a language
MCC to use the term “batters” throughout the Laws of Cricket
Ohtani delivers on mound, at plate as Angels top D-backs 6-5
Ohtani delivers on mound, at plate as Angels top D-backs 6-5
Book Excerpt: The Grandest Stage A History of the World Series - The New York Times