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From The Collaborative International Dictionary of English v.0.48:
Mumble \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. 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. [1913 Webster] Peace, you mumbling fool. --Shak. [1913 Webster] A wrinkled hag, with age grown double, Picking dry sticks, and mumbling to herself. --Otway. [1913 Webster] 2. To chew something gently with closed lips. [1913 Webster]