Possible Clues:

• Plaything that's ridden up and down
• Understand woodcutter made playground equipment
• Look, that looked as if it had its ups and downs
• How present and past vision both have their ups and downs
• Plank children play on
• Look at it going up and down and cutting for the carpenter
• Children's up-and-down play structure
• It goes up and down with the child
• Look, it looked as if it went up and down
• Playground furniture