1. 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。

2. He mumbled sth. to me but I could not hear what he said.
    他对我咕哝了几句，可是我没听清他说的什么。

1. Stop mumbling, for goodness sake.
    看在老天爷面上，别再咕哝了。

1. 叽咕,咕哝：Murmur:喃喃说话声,隔壁的人语声 | Mumble:叽咕,咕哝 | Grumble:肚子咕咕的叫声,牢骚

2. 喃喃而语：mum 沉默 | mumble 喃喃而语 | mumbletypeg 儿童游戏

3. mumble的翻译

3. 喃喃：├murmur咕咕噜噜 | └mumble喃喃 | come into fasion慰然成风

1. 咕哝;含糊地说
    If you mumble, you speak very quietly and not at all clearly with the result that the words are difficult to understand.

    e.g. Her grandmother mumbled in her sleep...
           她祖母含混不清地说着梦话。
    e.g. He mumbled a few words...
           他小声咕哝了一句。

1. a soft indistinct utterance

1. talk indistinctly
    usually in a low voice

    Synonym: muttermaundermussitate

2. grind with the gums
    chew without teeth and with great difficulty

    e.g. the old man had no teeth left and mumbled his food

    Synonym: gum