Pronunciation: /saʊnd ˈbɛriər/
noun a physical phenomenon that prevents the passage of sound waves
A1 The sound barrier is the limit to how fast sound can travel.
A2 Pilots have to break through the sound barrier when flying at supersonic speeds.
B1 Scientists have been studying ways to break the sound barrier without causing a sonic boom.
B2 The development of new technology has allowed aircraft to surpass the sound barrier more efficiently.
C1 Breaking the sound barrier was once considered impossible until it was achieved in the 1940s.
C2 The sound barrier is a phenomenon that has fascinated researchers and engineers for decades.
formal The aircraft broke through the sound barrier during its supersonic flight.
informal Did you hear that plane break the sound barrier? It was so loud!
slang That car goes so fast, it feels like it's about to break the sound barrier!
figurative She felt like she was hitting a sound barrier in her career, unable to move forward.
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