The opposite of muffling a sound would be amplifying.
Muffling what? Muffling screams in your basement? Soundproofed walls. Muffling somebody's snoring in bed? A sturdy pillow over their face, held firmly, until subject is no longer moving or breathing noticeably.
the muffling cat pooped in a toilet and peed on the ground
it is when you can not hear anything
yes
muffling
A muffling device
carpets, curtains and wood are best at muffling sound carpets, curtains and wood are best at muffling sound
A muffling device
A muffled sound. To muffle means to wrap with something to deaden sound (you know, for example, a girl is kidnapped by a gang and they put a handkerchief on her mouth. When she goes "Mmmph!", that's what muffling sounds like).
Most states do require a muffling device on boats. Most states do have exceptions like the age of the boat, but may have to be under a decibel level or if it is a racing competition, there are other requirements for those.
"Muffling" or "Baffling". To be academic: "Attenuation".
A working toilet