MUMBLE
Source: 566, 567
mumble. Mumble, v. to speak inwardly, mutter, chew fast
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Mum″ble (?), v. t. [imp. & p. p. Mumbled (?); p. pr. & vb. n. Mumbling (?).] [[OE. momelen; cf. D. mompelen, mommelen, G. mummelen, Sw. mumla, Dan. mumle. Cf. Mum, a., Mumm, Mump, v.]] 1. 1. To speak with the lips partly closed, so as to render the sounds inarticulate and imperfect; to utter words in a grumbling indistinct manner, indicating discontent or displeasure; to mutter.
Peace, you mumbling fool. Shak. A wrinkled hag, with age grown double, Picking dry sticks, and mumbling to herself. Otway. 2. 2. To chew something gently with closed lips.