put-put

名词 put-put:

1. a small gasoline engine (as on motor boat)

put-put

n.Slang （名词）【俚语】
A small gasoline engine.
小型汽油发动机
A vehicle, such as a boat, that is operated by a small gasoline engine.
小型汽油交通工具：由小型汽油发动机牵引的交通工具，例如汽船

来源：
[Imitative of a running engine]
[模仿发动机发出的声音]