wygłuszać

Etymology
From.

Verb

 * 1)  to dampen
 * 2)  to soundproof
 * 3)  to hush
 * 4)  to be soundproofed
 * 5)  to dampen
 * 6)  to dampen
 * 1)  to be soundproofed
 * 2)  to dampen
 * 3)  to dampen
 * 1)  to dampen