become flat

• 失去气泡或碳酸，通常指碳酸饮料跑气；也用于比喻失去活力、兴奋感或效力。

To lose carbonation or fizz, typically used for carbonated beverages; also used metaphorically to describe something that loses its energy, excitement, or effectiveness.

1. Lose carbonationA2informal

   To lose the bubbles or fizz, typically referring to a carbonated drink.

   走气

   • I left the soda open, and it became flat.
   • This beer has become flat; it tastes awful.
   • Make sure to close the bottle tightly so it doesn't become flat.

2. Lose energy or excitementB2informal

   To become dull, uninteresting, or lacking in energy.

   变得平淡

   • The party became flat after the music stopped.
   • His jokes became flat after he repeated them too many times.
   • The conversation became flat when no one had anything new to say.