warning track

Noun

(softball, baseball) The dirt or other material on the edge of a baseball or softball field that warns a player that he or she is approaching the fence, especially the portion in the outfield.

Japanese Meaning

（ソフトボール、野球用）グラウンドの外縁部、特に外野において、選手にフェンス接近の危険を警告するための砂利やその他の素材の敷地部分を指す。

What is this buttons?

She tracked the fly ball all the way to the warning track before making the catch.

Google Translation / DeepL Translation

彼女はフライを追って外野フェンス近くにある警告用の砂地まで走り、そこでキャッチした。

Details

Sense（1）

(softball, baseball) The dirt or other material on the edge of a baseball or softball field that warns a player that he or she is approaching the fence, especially the portion in the outfield.