noun
a process or material used to make a room or building resistant to sound transmission
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The soundproofing in this conference room is top-notch, ensuring privacy during important meetings.
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I added some soundproofing to my home office so I can focus better while working from home.
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I heard the new club has great soundproofing, so the music doesn't bother the neighbors.
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Emotional barriers can act as soundproofing, keeping us protected from external negativity.