Definitions

1. verb

to utter or pronounce with a muffled or muted sound, as if one’s mouth is stuffed or obstructed

“She mimmouthed her words, as if trying not to be overheard.”

2. adjective

describing a sound or utterance that is muffled or muted, as if one’s mouth is stuffed or obstructed

“The mimmouthed voice on the other end of the phone made it difficult to understand.”