the sound barriernoun [ S ]uk /ˈsaʊnd ˌbær.i.ər/ us /ˈsaʊnd ˌbær.i.ɚ/
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(Definition of “the sound barrier” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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said to emphasize that being part of a group makes you less likely to be harmed