1. to remove a covering from something that muffles or deadens sound
2. to remove wrappings or coverings from someone’s face or head

Examples

• She unmuffled the drums to let their full sound ring out.
• The musician unmuffled his trumpet before the solo.
• He unmuffled his face as he entered the warm building.
• The protesters unmuffled their voices and began chanting loudly.
• After the storm passed, they unmuffled the church bells.
• The actor unmuffled himself and delivered his lines clearly.