sound barrier (19 synonym found)

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Definition of sound barrier:

(n) : the apparent physical boundary (caused by a sudden increase in drag) preventing objects from becoming supersonic; a structure beside a highway designed to reduce the noise of traffic
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for sound barrier:
Definition of sound barrier:

(n) : the apparent physical boundary (caused by a sudden increase in drag) preventing objects from becoming supersonic; a structure beside a highway designed to reduce the noise of traffic
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