to lose steam
01
勢いを失う, やる気を失う
to lose momentum, energy, or enthusiasm for something, especially a task or project
![to [lose] steam definition and meaning](https://cdn.langeek.co/photo/40891/original/?type=jpeg "to [lose] steam definition and meaning")
idiom
例
The writer started the book with a lot of momentum, but they have been losing steam as they struggle to develop the plot and characters.
キャンペーンは最初の週の後、勢いを失った。
