barrier
/ˈbær·i·ər/ n [C]Definition
› anything used or acting to block someone from going somewhere or from doing something, or to block something from happening: The Secret Service erected concrete barriers around the White House. Jackie Robinson was the African-American who succeeded in breaking major league baseball’s color barrier (= use of race to block something from happening).
(Definition of barrier n from the Cambridge Academic Content Dictionary
© Cambridge University Press)
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