What does bullpen mean?
A bullpen is, first and foremost, the designated area beside or beyond a baseball field where relief pitchers warm up before entering a game; by extension it also refers collectively to a team's relief pitchers. The term has traveled well beyond the diamond: in journalism, advertising, and other office settings, a bullpen is a large open room where staff work side by side, evoking images of busy, collaborative — sometimes cramped — working conditions. The word's origins are uncertain, but it likely derives from the literal enclosures where bulls were confined before sale or slaughter, with baseball adopting the term in the early twentieth century. Today the baseball sense dominates American usage, while the workplace sense persists chiefly in media and creative industries, giving the word both a sporting and a professional register.
The area where baseball relief pitchers warm up before entering a game, or collectively the relief pitchers themselves.
"With the starter tiring, the manager signaled for the bullpen."
Almost always used with the definite article in this sense: 'the bullpen.'
A large shared workspace occupied by a group of employees, especially in journalism or advertising.
"Copywriters crammed into the agency's bullpen traded ideas across the desks."
Somewhat dated but still understood, particularly within the newspaper industry.
Standard pluralization applies; used when referring to multiple teams' relief corps or several such workrooms.
"Both bullpens were stretched thin after the extra-inning game."
Before it belonged to baseball, the 'bullpen' may have been exactly that — a pen where bulls were held before slaughter or sale.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bullpen
Bullpen is a compound of 'bull' and 'pen' (an enclosure), formed in English in the nineteenth century. Its original sense was literally a pen for holding bulls, and the exact path by which it came to mean a pitchers' warming area is debated — theories link it to holding pens, waiting areas, or slang for a reserve force. Baseball usage is firmly established by the early twentieth century, and the broader office-workspace sense developed shortly afterward in American journalism.
How bullpen is actually used
The baseball sense is dominant and standard in American English; the office-workroom sense, common in journalism and advertising circles, carries a slightly old-fashioned flavor. Both senses are informal-to-neutral in register.
Easily confused with bullpen
A bull ring is an arena for bullfighting, whereas a bullpen is either a baseball warm-up area or a shared office workspace.