動詞 burble:

1. flow in an irregular current with a bubbling noise
   同義詞：ripple, babble, guggle, bubble, gurgle

1. What's he burbling (on) about?
   他在胡扯些什麼呀?

bur.ble

n.（名詞）
A gurgling or bubbling sound, as of running water.
潺潺聲，汩汩聲：流水潺潺的或汩汩的聲音
A rapid, excited flow of speech.
快速，激動的發(fā)言
A separation in the boundary layer of fluid about a moving streamlined body, such as the wing of an airplane, causing a breakdown in the smooth flow of fluid and resulting in turbulence.
氣流分離：移動的流線型的軀體上流體邊界層上的分隔物，如飛機的機翼，在平滑的流體流動中會引起故障和湍流
v.intr.（不及物動詞）
bur.bled,bur.bling,bur.bles
To bubble; gurgle.
冒泡；涌出
To speak quickly and excitedly; gush.
說話快速而激動；滔滔不絕地說

來源：
Middle English burblen [to bubble]
中古英語 burblen [冒泡]

【引伸】
bur.bler
n.（名詞）
bur.bly
adj.（形容詞）