muffle (v.) Look up muffle at Dictionary.com
early 15c., "to cover or wrap (something) to conceal or protect," perhaps from M.Fr. mofler "to stuff," from O.Fr. moufle "thick glove, muff" (cf. O.Fr. enmoufle "wrapped up"); see muff (n.). Meaning "wrap something up to deaden sound" first recorded 1761. Related: Muffled; muffling.