1 Often, muffle up. wrap, swathe, swaddle, cloak, envelop, cover (up), enfold, shroud, enshroud, conceal, protect:
Make sure your neck is muffled when you're out in that icy wind.
2 deaden, silence, suppress, stifle, subdue, damp, dampen, mute, hush, quiet, tone down, still:
A few more thicknesses of flannel will muffle the noise of the motor.