balloon的意思是“气球”,可指玩具气球或装饰性气球,还可指实用的热气球。

go down like a lead balloon
(讲话、建议等)未达到预期的效果,毫无作用 (of a remark, suggestion, etc.) fail to
His jokes about woman drivers went down like a lead balloon.他讲了不少女人驾车的笑话,但没人笑。

when the balloon goes up
厄运当头when an unpleasant situation began
I don't want to be around when the balloon goes up.要出事了，我趁早离开是非之地。

Many children like balloons.许多孩子都喜欢气球。
They have let fly multi-colored balloons.他们放飞了五颜六色的气球。
The balloon was invented before the plane.热气球是在飞机发明之前发明的。

balloon还可用作动词，意思是“乘气球上升；乘气球飞行”。例如：
Let's go ballooning tomorrow.我们明天去乘气球飞行吧。