To muffle is to quiet a sound, usually by wrapping it with something. If you try to speak with a scarf over your mouth, your voice will be muffled.

When a hitman puts a silencer on a gun, he's muffling the sound of gunshots, since muffling makes things quieter. Usually, muffling involves wrapping something around or putting something over a noisy thing. Muffling dampens, tones down, deadens, and dulls. Also, if you hold down your emotions and don't express them, you're muffling them. Muffling keeps things quiet.

Definitions of muffle
  1. verb
    deaden (a sound or noise), especially by wrapping
    synonyms: damp, dampen, dull, mute, tone down
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    type of:
    make (images or sounds) soft or softer
  2. verb
    conceal or hide
    muffle one's anger”
    synonyms: repress, smother, stifle, strangle
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    type of:
    conquer, curb, inhibit, stamp down, subdue, suppress
    to put down by force or authority
  3. noun
    a kiln with an inner chamber for firing things at a low temperature
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    type of:
    a furnace for firing or burning or drying such things as porcelain or bricks
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