Related Clues:

• Doesn't stay up
• Comes down
• Succumbs to gravity
• Yields to pressure
• Loses solidity
• Loses energy
• Loses buoyancy
• Hangs down
• Loses rigidity
• Isn't straight in the middle
• Reacts to gravity
• Slackens
• Exhibits a swayback
• Takes a dip
• Hangs low