Meaning of “the sound barrier” in the English Dictionary

british 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)