His voice, which had been so cheerful about my arrival, suddenly became muffled.
From the morningstaronline.co.uk
He lay down on the bed, muffled his pistol with a pillow and pulled the trigger.
From the bostonherald.com
The beat is slowing on the Sunset Strip, muffled by a less-than-festive economy.
From the latimes.com
At close quarters, it is a muffled cough, while at long distances it is sharper.
From the en.wikipedia.org
Muffled microphones and too-loud music combined for a hard-to-hear performance.
From the stltoday.com
From the ship's tannoy the muffled tones of praise from one of the bridge team.
From the navynews.co.uk
With a vacant look and muffled answers, he vowed to be back stronger next season.
From the delawareonline.com
Compared with regular earbuds, the Audio Bones sound muffled, with less presence.
From the nytimes.com
Ahead is the muffled thump and dump of the Atlantic claiming the perfect beach.
From the washingtonpost.com
More examples
Dull: being or made softer or less loud or clear; "the dull boom of distant breaking waves"; "muffled drums"; "the muffled noises of the street"; "muted trumpets"
Wrapped up especially for protection or secrecy; "children muffled almost to the eyebrows"
(muffledly) In a muffled manner; indistinctly
Sounds like it is covered with a blanket. Weak highs or weak upper mids.
A bell is muffled by attaching a relatively soft object, the muffle, to the clapper, causing it to strike the bell more quietly than usual. See also half-muffled.
A kiln with an inner chamber for firing things at a low temperature
Smother: conceal or hide; "smother a yawn"; "muffle one's anger"; "strangle a yawn"
Deaden (a sound or noise), especially by wrapping
(muffled) dull: being or made softer or less loud or clear; "the dull boom of distant breaking waves"; "muffled drums"; "the muffled noises of the street"; "muted trumpets"