Hum.
美 [hʌm] 
英 [hʌm] 
- n.嗡嗡声;交流声;哼哼声;嘈杂声
 - v.哼(歌曲);〈口语〉欺骗;发出嗡嗡声或呼呼声:;(在嘴里)咕咕哝哝
 - int.哼!(表示轻蔑、踌躇、怀疑等)
 - 网络嗯;嗡嗡叫;人可不可以更简单
 
Hum.
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1.  | [i][t] 哼(曲子)to sing a tune with your lips closed  | 
She was humming softly to herself. 她在轻声哼着曲子。  | |
What's that tune you're humming? 你哼的是什么曲子?  | 
2.  | [i] 发嗡嗡声to make a low continuous sound  | 
The computers were humming away. 计算机在嗡嗡作响。  | 
3.  | [i] 活跃;繁忙to be full of activity  | 
The streets were beginning to hum with life. 街道开始热闹起来。  | 
IDM
hum and haw
(informal)
犹豫不决;支支吾吾;嗯嗯呃呃to take a long time to make a decision or before you say sth