also: ブル・ペン
noun
bullpen
Baseball term for the area where relief pitchers warm up, or by extension the group of relief pitchers.
先発投手が打たれて、ブルペンではすぐに救援投手が肩を作り始めた。
After the starter got hit, the relief pitchers in the bullpen quickly began to warm up.
Standard katakana spelling for the baseball term.
Explicitly separated form, rarely used in practice.
Borrowed from English 'bullpen'.