sound barrier

It was called, rather dramatically, breaking the sound barrier.

Pawel Szaniawski talks to the extreme athlete about the stunt, its purpose, and what it will feel like to break the sound barrier.

You have heard the sound barrier, of a plane breaking the sound barrier, bang, bang?

Again, I am going to refer to it as like a plane going through a sound barrier; bang, bang.

Even in this era of sophisticated flight there have been those who said the sound barrier would never be broken.