bumble
/ˈbʌmbl; `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麽呀?
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.