mutter
v.
early 14c., moteren "to mumble," from a common PIE imitative *mut- "to grunt, mutter" (cognates: 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.
n.
1630s, from mutter, v..