“Nonsense,” muttered Hawberk, searching on the floor for a fallen rivet.
While Mahoney prayed, Rev. Rob Schenck turned his palms to the sky and muttered, “Yes” and “Have mercy” over and over.
More interesting is what Rod Blagojevich might have muttered.
early 14c., moteren "to mumble," from a common PIE imitative *mut- "to grunt, mutter" (cf. Old Norse muðla "to murmur," Latin muttire "to mutter," Old High German mutilon "to murmur, mutter; to drizzle"), with frequentative suffix -er. Related: Muttered; muttering.
1630s, from mutter (v.).