Related Clues:

• Isn't taut
• Is dispirited, having lost nucleus of savings
• Declines in the middle
• Goes soft
• Goes south?
• Loses zip
• Declines in the center
• Mind, in a way
• Droops like an old sofa
• Droops in the middle
• Needs firming up
• Takes a nosedive
• What a heavily laden clothesline does
• Becomes less taut
• Gets less firm