the sound barrier Meaning in the Cambridge English Dictionary
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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   us  
a ​largeincrease in the ​forceopposing a ​movingobject as ​itsspeedreaches the ​speed at which ​soundtravels: There is usually a ​sonicboom when an ​aircraft breaks the ​soundbarrier.
(Definition of the sound barrier from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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