There is no moon, she added, her voice dropping to a mumble....
"Melomaniacs"
James Huneker
You didn't know, I suppose, that I have learned a good many French words from the mistress: such as du pain, which means bread; and le the, for tea; and sucre, which a'n't much different from our sugar, only you mumble it up in your mouth before speaking, and let it all out at once.
"Wives and Widows; or The Broken Life"
Ann S. Stephens
The cook ventured to mumble an objection.
"The Song of Songs"
Hermann Sudermann