with obj.(常作be muffled)
1- wrap or cover for warmth（为保暖等）围裹, 裹住; 蒙住：
it was very cold and everyone was muffled up in coats and scarves.
天很冷, 人人都严严实实地裹着大衣和围巾。
1.1
- cover or wrap up (a source of sound) to reduce its loudness包住（声源）以压低声响：
as adj. muffled the soft beat of a muffled drum.被压低的击鼓声。
1.2
- make (a sound) quieter or less distinct使（声音）轻微（或低沉）：
his voice was muffled.
他压低了声音。
1.3
- restrain or conceal (someone) with wrappings（为限制行动或藏匿而）蒙住, 包住（某人）：
the boy was bound and muffled.
男孩被捆绑并被蒙起来。
usu. as modifier
- a receptacle in a furnace or kiln in which things can be heated without contact with combustion products隔焰窑; 隔焰室：
a muffle furnace.
隔焰炉, 回热炉, 膛式炉。
词源
late Middle English (as a verb)： perhaps a shortening of Old French enmoufler; the noun （mid 17th cent.） from Old French moufle 'thick glove'.