ボール
ボール
booru
= ball
Borrowed from English, booru (ボール) might seem like a simple loanword—but in Japan it developed a life of its own inside the baseball diamond. The term booru-dama (a pitch outside the strike zone) reflects how deeply baseball is woven into everyday Japanese speech, turning a borrowed word into something distinctly Japanese.
Booru covers any round, throwable object used in sport or play: a soccer ball, a basketball, a rubber ball for children. In non-sport contexts it can describe the physical object (booru o nageru, to throw a ball). Its most culturally loaded use, however, is in baseball, where booru alone—without any modifier—means a called ball, a pitch the umpire judges outside the strike zone. This is why a Japanese baseball fan hears the umpire call booru! after a wild pitch: the word has been repurposed beyond its English origin to carry a rule-specific meaning unique to Japanese baseball terminology.
Learners sometimes confuse booru with boru—there is no shortened form in standard Japanese. Also watch the context: in a baseball broadcast, booru without any other word almost always means a called ball, not the physical object. If you want to say ‘the pitcher threw the ball,’ you need booru o nageta to make it clear you mean the physical ball, not the call.
Everyday use
公園でキャッチボールをしよう。
Kouen de kyacchi booru wo shiyou.
Let’s play catch in the park.
Casual / Social Media
今日の練習、ボールのコントロールがよかったね！
Kyou no renshuu, booru no kontororu ga yokatta ne!
Your ball control was really good in today’s practice!
Formal / Cultural context
スリーボール・ツーストライクと追い込まれた場面で、投手は外角低めにボールを投じた。
Surii booru tsuu sutoraiku to oikomareta bamen de, toushu wa sotokado hikume ni booru wo touji ta.
With a full count, the pitcher threw a ball low and outside.
Baseball arrived in Japan in 1872 and took root so completely that the sport’s vocabulary—including booru—was absorbed directly from English. Over time, Japanese broadcasters and scorekeepers gave booru a second, rule-bound identity: a pitch outside the strike zone that counts toward walking a batter. Four such calls send the batter to first base, a moment the announcer marks simply by saying booru! This dual life of the word—physical object and umpire’s ruling—exists in no other major language that plays baseball.
The compound kyacchi booru (catch ball) illustrates another cultural adaptation: in Japan, tossing a ball back and forth with a friend or family member at the park is called kyacchi booru and is treated as a wholesome, almost ceremonial pastime rather than mere warm-up. On weekends, fathers and children playing kyacchi booru is a recognizable image in Japanese media, signaling family bonding and a connection to baseball’s grassroots culture.