Soundproof (verb)

1. To make (a room or other enclosure) so as to prevent the passage of sound.
2. To make a room or other enclosure so as to prevent the passage of sound.

Origin:

From sound + proof.

Examples:

1. The walls were soundproofed to keep the noise from the street out of the bedroom.
2. The recording studio was soundproofed to ensure that no sound from the outside would be recorded.
3. The windows and doors were soundproofed to keep the noise out.
4. The conference room was soundproofed to keep the noise from outside the room.
5. The home theater was soundproofed to enhance the movie watching experience.