the.com/mutter

the sound of a thought that didn't fully commit to being said

means To speak in a low, indistinct voice, often complaining or grumbling under your breath so you're heard but not quite understood.

from From Middle English 'moteren,' an echoic word — meaning it imitates the very sound it names, that low 'mut-mut-mut' rumble. It's related to a family of murmuring words across Germanic and Latin tongues (compare Latin 'muttire,' to mutter or mumble), all of them likely born from the same instinct: the human noise for speech that barely escapes the mouth.

german twist
means mother in German, said clearly not under breath
engine noise
low rumbling machinery is said to mutter
latin root
from muttire, to murmur or mumble
crowd verb
discontent spreads as a muttering through a room
for instance

britain's parliament — mps frequently mutter complaints and asides during debates in the house of commons

harry potter spells — wizards mutter incantations like 'expecto patronum' to cast spells in the books and films

joe biden press conferences — the u.s. president is frequently caught muttering comments under his breath on camera, sometimes audible to reporters

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