warning track
noun Baseball.
a strip, often consisting of a cinder or dirt track, bordering the outer edge of the outfield between the outfield turf and the stadium wall that alerts outfielders that the wall is near, especially as they back up to catch a fly ball.
Origin of warning track
First recorded in 1965–70
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019