sonic boomnoun [ C usually singular ]uk /ˌsɒn.ɪk ˈbuːm/ us /ˌsɑː.nɪk ˈbuːm/
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(Definition of “sonic boom” 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