/'bʌmbl; `bʌmbl/
v
1 [I, Ipr, Ip] ~ (on) (about sth) speak in a rambling and clumsy manner 语无伦次地说
*What are you bumbling (on) about? 你颠三倒四地说些什么呀?
2 (phr v) bumble about, along, etc act or move in a specified direction in a clumsy disorganized manner 笨拙而无规则地活动; 跌跌撞撞地行进
*The professor bumbled absent-mindedly along the road. 教授心不在焉地沿途瞎遛.

v [I]
[Date: 1500-1600; Origin: Probably from bungle]
alsobumble on
to speak in a confused way so that no one can understand you
　What was Karl bumbling on about?
alsobumble around
to move in an unsteady way