backstop

1 ENTRIES FOUND:
backstop /ˈbækˌstɑːp/ noun
plural backstops
backstop
/ˈbækˌstɑːp/
noun
plural backstops
Britannica Dictionary definition of BACKSTOP
1 
[count] baseball
a  : a fence or screen that is placed behind the catcher to prevent the ball from rolling away
2 
[singular] : something that is kept so that it can be used if it is needed