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Meaning of “the sound barrier” in the English Dictionary

"the sound barrier" in British English

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the sound barriernoun [S]

uk   /ˈsaʊnd ˌbær.i.ər/  us   /ˈsaʊnd ˌbær.i.ɚ/
a large increase in the force opposing a moving object as its speed reaches the speed at which sound travels: There is usually a sonic boom when an aircraft breaks the sound barrier.
(Definition of the sound barrier from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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