Muting is the power to take away someone's voice.
The users of this ability can remove a target's ability to make sound with their mouths, rendering them unable to speak.
This power is shown to be quite useful against witches since they need their voice in order to cast spells. However, some more experienced witches might be able to cancel out this ability. Through her many years of experience as a witch, Marisol Vera was able to learn how to negate the effects of Charity's muting by merely touching her throat with her fingers.