- A thing or a person put in the rear or in the back of something to reinforce, hold, support.
- (rounders) The player who stands immediately behind the striking base.
- (baseball slang) A catcher; the position of catcher.
- (cricket, dated) The wicket-keeper.
- (baseball) A wall or fence behind home plate.
- (cricket, dated) The longstop.
- (transitive) To bolster, support.
- (transitive) To serve as backstop for.