Direction:
* The ball rolled down the hill.
* She walked down the street.
* The plane is flying down to the airport.
Position:
* The book is lying down on the table.
* He looked down at his feet.
* I have a pain down my leg.
Reduction:
* The price of gas has gone down.
* Her spirits were down after she lost her job.
* The temperature is down to freezing.
Emphasis:
* Down with the tyranny! (meaning "against" or "opposing")
* Down the hatch! (meaning "drink it quickly")
* Down boy! (meaning "calm down")
Other uses:
* He sat down on the sofa.
* I'm down for whatever you want to do. (meaning "agreeing")
* She was down with the flu. (meaning "suffering from")
Remember, the meaning of "down" can vary depending on the context.