verb (used with object)
Examples from the Web for soundproof
There would have been no birth certificates because Dugard was forced her to give birth in a soundproof structure in the backyard.
It was Lillian; she must have just come out of the soundproof speech-lab.
Yes, he could put up something big enough for everything the girls would need to install, and soundproof it.
The wireless office was soundproof and practically airtight.Pincher Martin, O.D.|H. Taprell Dorling
But even if they had time to look it up, which they didn't, the contestant couldn't hear them in a soundproof booth.The Electronic Mind Reader|John Blaine
They were within ten yards of the plane when a wail of anguish was born—and died—in two soundproof helmets.Lords of the Stratosphere|Arthur J. Burks