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had been muttering
  • past perfect progressive of mutter.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

He was quickly interrupted by Ms. Pirro, who had been muttering in disapproving tones as Mr. Gutfeld was speaking.

From New York Times • Apr. 20, 2021

And it didn't take too long for a leading US coach to say what many had been muttering.

From The Guardian • Jul. 31, 2012

But they had been muttering angrily ever since Congress refused to grant appropriations to the Commodity Credit Corp. last summer for more crop storage bins.

From Time Magazine Archive

Was it Bill Clinton, as restless as a sidelined Michael Jordan during play-off season, who had been muttering quietly to just about everyone for weeks that his buddy Al's campaign was a mess?

From Time Magazine Archive

The boy, who had been muttering something about Harry behind his hand to his friend, promptly turned scarlet and toppled out of the hole in alarm.

From "Harry Potter and the Half-Blood Prince" by J.K. Rowling