Main Entry: ¹back·stop

Pronunciation: \-ˌstäp\

Function: noun

Date: 1851

1 : something at the back serving as a stop: as a : a screen or fence for keeping a ball from leaving the field of play b : a stop (as a pawl) that prevents a backward movement (as of a wheel)
2 : a player (as the catcher) positioned behind the batter