Dictionary

1soundproof

adjective sound·proof \ˈsan(d)-ˌprüf\

: not allowing sound to enter or leave

Full Definition of SOUNDPROOF

:  impervious to sound

First Known Use of SOUNDPROOF

circa 1878

2soundproof

transitive verb

: to make (something) soundproof

Full Definition of SOUNDPROOF

:  to insulate so as to obstruct the passage of sound

First Known Use of SOUNDPROOF

1919

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