To descend or fall from a higher place to a lower one. The cat will come down from the tree when it feels safe.
To decrease in price or level. The cost of electronics tends to come down after a few months.
To become ill, especially with a cold or flu. I think I'm coming down with a cold.
To be passed down through generations. This necklace has come down through the family for generations.
To make a decision or judgment. The judge will come down in favor of the plaintiff.