noun
coach's box
In baseball, the marked area near first and third base where base coaches stand.
一塁コーチはコーチボックスから選手にサインを送る。
The first-base coach sends signs to the players from the coach's box.
Variant with a middle dot, sometimes used in printed materials.
Borrowed from English 'coach's box', referring to the designated area for base coaches in baseball.