Answer: mumble

AnswerCrossword Clue
MUMBLEHave marbles in one's mouth
MUMBLEBe hard to understand, in a way
MUMBLESpeak under one's breath
MUMBLESpeak unclearly
MUMBLEChew words
MUMBLESwallow one's words
MUMBLESpeak indecipherably, perhaps
MUMBLESpeak indistinctly
mumbleto speak indistinctly
mumbleSay something indistinctly and quietly, making it difficult for others to hear
mumbleBite or chew with toothless gums or eat without making much use of the teeth