Related Clues:

• Turns sour
• Makes the fridge stink, perhaps
• Turns into compost
• Starts to stink, say
• Sours
• Goes bad, as fruit
• Turns bad
• Languishes: slang
• Goes to the dogs
• Turns to compost
• Goes to hell
• Turns in the fridge
• Crumbles
• Languishes in the lockup
• Addles