Related Clues:

• Moulders
• Turns
• Makes a stink?
• Goes to seed
• Decays
• Doesn't keep?
• Goes sour
• Goes to pot
• Raises a stink?
• Degenerates
• Crumbles up
• Fails to keep
• Turns sour
• Makes the fridge stink, perhaps
• Turns into compost