1. the balloon goes up : [口](行动、战争、事件、骚动等)开始, 发动(时)；
及物动词
不及物动词
名词
1. 气球
A balloon is a small, thin, rubber bag that you blow air into so that it becomes larger and rounder or longer. Balloons are used as toys or decorations.
2. 热气球
A balloon is a large, strong bag filled with gas or hot air, which can carry passengers in a container that hangs underneath it.
3. （数量）激增，猛涨，快速膨胀
When something balloons, it increases rapidly in amount.
1. large tough nonrigid bag filled with gas or heated air
2. small thin inflatable rubber bag with narrow neck