muf ‧ fle /ˈmʌf ə l/ BrE AmE verb [transitive]
[ Date: 1400-1500 ; Origin: Perhaps from Old French moufle 'glove' , from Medieval Latin moffula ; ⇨ ↑ muff 1 ]
1 . to make a sound less loud and clear, especially by covering something:
The falling snow muffled the sound of our footsteps.
Her voice was muffled by the pillow in which she had hidden her face.
2 . ( also muffle somebody up ) [usually passive] to cover yourself or another person with something thick and warm SYN wrap up
be muffled (up) in something
Penelope arrived, muffled up in a thick coat.