mumbles
n.
含糊的话或声音，咕哝( mumble的名词复数 );
v.
含糊地说某事，叽咕，咕哝( mumble的第三人称单数 );
例句:
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He always mumbles when he's embarrassed.
他感到难为情时说话就含糊不清了。
来自《权威词典》
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From his staff he earned the sobriquet "Mumbles".
他的员工给他起了个“咕哝虫”的绰号。
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When the old lady speaks she often mumbles her words.
这位老妇人说起话来常常含糊不清.
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My people, he mumbles, let another do it.
来自NEWYORKER
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The calf with gilded horns, who...mumbles with the flowers of the garland.
来自F. Marryat
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The driver mumbles an excuse, but the trooper isn't buying it.
来自VOA