Down

: It often refers to a state of being out of order ("the system is down") or a feeling of sadness ("feeling down"). "Down" in Nature and Science

: Refers to something happening in the future or further along a process. : It often refers to a state of

In the natural world, "down" refers to the soft, fine feathers found under the tougher exterior feathers of birds. These are highly prized for their insulation properties and are commonly used in high-end pillows, comforters, and winter jackets. These are highly prized for their insulation properties

: A classic phrase for feeling unhappy or discouraged. "Feeling down" is a common colloquialism for experiencing

The word often carries a heavy emotional weight. "Feeling down" is a common colloquialism for experiencing low mood or clinical depression. Conversely, in modern slang, being "down for something" means you are interested, willing, or agreeable to a plan.