He's off in his own world, muttering about the coming of a dragon or something.
He muttered something about the Public being good enough for him.
They have won five of their last six and are still muttering about the one that got away.
She thought he muttered something about "not fair" under his breath.
"Is he still muttering about that man having done it?"
He muttered something about a letter somewhere on his person.
She muttered something about stature and looked at both of them.
Then he shook his head and muttered something about women.
He muttered something about the good news being that it was all downhill from here.
He muttered something about his faith having been tested enough.
Eve couldn't understand what he was muttering about, and he didn't take it kindly when she leaned over his shoulder.
Now the crew on the other boat began to mutter and move about, and Hawkmoon wondered why they did not cast off.
"What the hell are you muttering about?"
Words like "insane" and "impossible" were muttered about and occasionally shouted aloud.
He hadn't the vaguest idea of their nature, nor what they were muttering about.
Nobody bothered to ask what I was muttering about.
Page snapped himself back to the deck of the California and Cogley wisely decided not to pursue whatever the captain had been muttering about.
The aliens began to mutter and shift about, talking among themselves.
Now, as the spell broke, people began to mutter and move about.
If "employers" do go down the route you darkly mutter about, they are contributing nicely to the continued polarisation of society.