Mumble \Mum"ble\, v. t.

1. To utter with a low, inarticulate voice. --Bp. Hall.

2. To chew or bite gently, as one without teeth.

Gums unarmed, to mumble meat in vain. --Dryden.

3. To suppress, or utter imperfectly.

Source: Webster's Revised Unabridged Dictionary (1913)
 

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.

Peace, you mumbling fool. --Shak.

A wrinkled hag, with age grown double, Picking dry sticks, and mumbling to herself. --Otway.

2. To chew something gently with closed lips.

Source: Webster's Revised Unabridged Dictionary (1913)