Related Clues:

• Is no longer firm
• Gives in to gravity
• Weakens
• Caves
• Doesn't hold up well
• Is swayback
• Gives a bit
• Doesn't stay up
• Falls to the next level
• Comes down
• Drops in the ocean
• Succumbs to gravity
• Yields to pressure
• Loses solidity
• Floats antonym