say it: BAK-stahp
backstop is a noun and verb meaning "(baseball) the person who plays the position of catcher". It carries 4 recorded senses.
(baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field
baseball
a precaution in case of an emergency
“he acted as a backstop in case anything went wrong”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for backstop come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.