to  break  the sound barrier
break
breɪk
breik
the
ðə
dhē
sound
saʊnd
sawnd
barrier
bæriə
bāriē

Definition & Meaning of "break the sound barrier"in English

to break the sound barrier
01

to travel faster than the speed of sound, approximately 767 mph or 1,235 km/h at sea level, generating a sonic boom 

Examples
The fighter jet broke the sound barrier during its test flight. 
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