sound barrier
Concise Oxford English Dictionary © 2008 Oxford University Press:
sound barrier
▶noun the speed of sound, regarded as presenting problems of drag, controllability, etc. for aircraft.
'sound barrier' also found in these Oxford entries:
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sound barrierConcise Oxford English Dictionary © 2008 Oxford University Press: sound barrier ▶noun the speed of sound, regarded as presenting problems of drag, controllability, etc. for aircraft. 'sound barrier' also found in these Oxford entries:
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