A chattering and hurrying of people could be heard as an undertone.
"I will go with you quietly," he said to them, in an undertone.
They had been speaking in an undertone, standing together at a window, apart from the rest.
"That's Mrs. Wimby's husband," said the judge in an undertone.
Then, knowing Nani's history, he related it in an undertone.
All this was muttered ...