go bad

• 变质、腐坏，通常指食物；也用于比喻情况变糟，或人变坏、堕落。

To decay, spoil, or become rotten, typically referring to food; also used figuratively to describe a situation turning negative or a person becoming corrupt or dishonest.

1. Food spoilageA2informal

   To become unfit for consumption due to decay or contamination.

   变质

   • The milk went bad because it was left out of the fridge.
   • Check the expiration date before the food goes bad.
   • If you don't store it properly, the meat will go bad quickly.

2. Deterioration of a situationB1informal

   To become worse or less favorable over time.

   情况恶化

   • The weather went bad, so we canceled the picnic.
   • Their relationship went bad after the argument.
   • The economy went bad during the recession.