DictionaryRoot: momelen
Middle English
momelen
to eat slowly and ineffectively
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verb / noun
mumble
MUM-buhl/ˈmʌmbl/
Speech in a low voice that is hard to understand.
Etymology
Momelen first described slow, ineffective eating, perhaps talking with one's mouth full, before denoting indistinct speech. It was probably a frequentative formation from mum, the closed-mouth sound.