Related Clues:

• "Bah!"
• Root problem?
• Stay forever, as in jail
• Undergo decomposition
• Sit in a dump
• Start to smell, maybe
• Problem affecting old lumber
• Meaningless talk
• Turn rancid
• Become moldy
• Nonsense, to a Brit
• Turn into compost
• Mumbo-jumbo
• Jabberwocky
• It doesn't add up