sonic boom Meaning in the Cambridge English Dictionary
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Meaning of “sonic boom” in the English Dictionary

"sonic boom" in British English

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sonic boomnoun [C usually singular]

uk   us  
an ​explosivesound made by an ​aircraft, ​bullet, etc. ​travellingfaster than the ​speed at which ​soundtravels
(Definition of sonic boom from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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