That said, Samuel Alito is my new mini-hero for muttering truth to power.
But all that ass-shaking as part of the showpersonship—mm, one could guess what the gospel maestro might be muttering.
Nerds, by definition, are supposed to be muttering bitter observations in the background, not basking in the spotlight.
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.).