Word: backstop
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A thing or a person put in the rear or in the back of something to reinforce, hold, support.
A default arrangement that holds if all else fails.
A wall or fence behind home plate.
A catcher; the position of catcher.
(rounders) The player who stands immediately behind the striking base.
The longstop.
The wicket-keeper.
Something serving to bolster or support a cover story etc.
To serve as backstop for.
To bolster, support.
You can find a list of possible crossword clues for BACKSTOP below.