foundry proof ( synonym found)
Definition of foundry proof:

°Describing something that does not allow sound through.
"The contestant was placed in a soundproof booth so he could not receive help from the audience."
°To make resistant to transmitting sound.
"We soundproofed the room so we couldn't hear the road noises; unfortunately we couldn't hear the fire alarm either."
Definition of foundry proof:

°Describing something that does not allow sound through.
"The contestant was placed in a soundproof booth so he could not receive help from the audience."
°To make resistant to transmitting sound.
"We soundproofed the room so we couldn't hear the road noises; unfortunately we couldn't hear the fire alarm either."
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