Susanna's entrance gives Marcellina the opportunity for some spiteful muttering.
From the guardian.co.uk
All the gripes about the business climate seem like muttering about the weather.
From the economist.com
Excitement turns to squinting and muttering as I have a closer look at the cells.
From the telegraph.co.uk
Muttering about the old colonial power throwing its weight around may be heard.
From the economist.com
You've heard this before, possibly from someone muttering next to you on a bus.
From the time.com
At 145th, the boy farther from me exited, muttering something under his breath.
From the nytimes.com
First a low muttering in my ear, then, further off, a sound like a cooing dove.
From the guardian.co.uk
Muttering to herself, Williams found herself fighting from behind again at 2-4.
From the usatoday.com
But Farah lay prostrate on the track, muttering a prayer into the blue asphalt.
From the guardian.co.uk
More examples
A low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
Mumble: talk indistinctly; usually in a low voice
Grumble: a complaint uttered in a low and indistinct tone
Murmur: make complaining remarks or noises under one's breath; "she grumbles when she feels overworked"
Mutter (German for "mother") is the third album by German industrial metal band Rammstein. It was released on 2 April 2001 through Motor Music.
Metacity (rhyming with "capacity" with the stress on the second syllable) is a window manager used by default in the GNOME desktop environment. The development of Metacity was started by Havoc Pennington and it is released under the GNU General Public License.
Mutter is a compositing window manager used in GNOME 3.0. Mutter is the short form of 'metacity clutter'. Mutter combines a sophisticated display engine using the Clutter toolkit with solid window-management logic inherited from the Metacity window manager. ...
Mutters is a municipality in the Innsbruck-Land district and is located south of Innsbruck. The village was first mentioned in 1100 but settlement already began app. 3000 years ago. Mutters received connection with Innsbruck thanks to the Stubaitalbahn in 1904. It has 1983 inhabitants and six areas.
A repressed or obscure utterance; an instance of muttering; peas; To utter words, especially complaints or angry expressions, indistinctly or with a low voice and lips partly closed; to say under one's breath; To speak softly and incoherently, or with imperfect articulations; To make a sound ...