B2 to speak quietly and in a low voice that is not easy to hear, often when you are worried or complaining about something嘟囔,咕哝
More examples
One guest at the crowded reception was heard to mutter "It's like the Black Hole of Calcutta in here."
She was muttering curses as she fumbled for the light switch.
'I didn't know it would be this expensive,' he muttered.
[ S ] (the sound of) words being said very quietly低语(声)
[ C ] a complaint that is made to only a few people嘀咕,私下抱怨
verb
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