1. noun /daʊn/
a) Field, especially for racing.
Churchill Downs, Upson Downs (from Auntie Mame, by Patrick Dennis).
b) A single play, from the time the ball is snapped (the start) to the time the whistle is blown (the end) when the ball is down, or is downed.
I bet after the third down, the kicker will replace the quarterback on the field.
2. adverb /daʊn/
The cat jumped down from the table.
His place is farther down the road.
3. preposition /daʊn/
a) From the higher end to the lower of.
The ball rolled down the hill.
b) From one end to another of.
The bus went down the street.
4. adjective /daʊn/
a) Depressed, feeling low.
So, things got you down? / Is Rodney Dangerfield giving you no respect? / Well, bunky, cheer up!
b) On a lower level than before.
The stock market is down.
5. verb /daʊn/
a) To drink or swallow, especially without stopping before the vessel containing the liquid is empty.
He downed an ale and ordered another.
b) To cause to come down.
The storm downed several old trees along the highway.
Wikipedia foundation.