Question

mumble 【mumble】v.喃喃而言；咕哝The old man mumbled something to me, but I could not understand him.那老人向我咕哝一些事，但是我不懂他在说什么。

Accepted Answer

['mʌmbl] 
mumbletalk indistinctly; usually in a low voice
To mumble is to talk quietly and indistinctly. When people speak in a mumble, it's hard to understand them.
Mumbling is a way of speaking that’s a little like whispering. Like whispering, mumbling is usually done with a low voice. However, mumbling is harder to understand than a whisper. When we mumble, we don't form out words clearly. Mumbling is the opposite of speaking clearly. Some people mumble because they lack confidence. Others might mumble because they're tired or not feeling well. If you want to be a good public speaker, you'd better learn to not mumble.
All forms of 'mumble' will appear on average once every 1191 pages.mumblemumblermumbling

Front	mumble
Pron	['mʌmbl]
Back	【mumble】v.喃喃而言；咕哝 The old man mumbled something to me, but I could not understand him. 那老人向我咕哝一些事，但是我不懂他在说什么。
Vocab	mumbletalk indistinctly; usually in a low voice To mumble is to talk quietly and indistinctly. When people speak in a mumble, it's hard to understand them. Mumbling is a way of speaking that’s a little like whispering. Like whispering, mumbling is usually done with a low voice. However, mumbling is harder to understand than a whisper. When we mumble, we don't form out words clearly. Mumbling is the opposite of speaking clearly. Some people mumble because they lack confidence. Others might mumble because they're tired or not feeling well. If you want to be a good public speaker, you'd better learn to not mumble. All forms of 'mumble' will appear on average once every 1191 pages. mumble mumbler mumbling

Mumble Mumbling Understand Talk Low People Speaking Mʌmbl