Crossword Genius

*Snapping a whip breaks it (5,7)

Ross

I believe the answer is:

sound barrier

(Other definitions for sound barrier that I've seen before include "Speed-related problem (for aircraft)" , "It is passed with a boom" , "Air resistance" .)

I've seen this clue in The Wall Street Journal.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.