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sound barrier

Also called sonic barrier, transonic barrier. (not in technical use) a hypothetical barrier to flight beyond the speed of sound, so postulated because aircraft undergo an abruptly increasing drag force induced by compression of the surrounding air when traveling near the speed of sound.
break the sound barrier, to travel faster than the speed of sound.
Origin of sound barrier
First recorded in 1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for sound barrier

sound barrier

(not in technical usage) a hypothetical barrier to flight at or above the speed of sound, when a sudden large increase in drag occurs Also called sonic barrier, transonic barrier
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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sound barrier in Science
sound barrier  
The sharp increase in drag experienced by aircraft approaching the speed of sound. Also called sonic barrier.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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sound barrier in Culture

sound barrier definition

The sudden increase in air resistance that occurs when an aircraft approaches the speed of sound. This is also called the sonic barrier.

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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