"run down" is better to used as "run-down". It means "shabby" (破舊), "dilapidated" (颓垝).
2012-11-24 08:40:19 補充：
It is Thanksgiving Day, so I take it easy on myself.
Happy Thanksgiving to you, master Jim and 26535! How is the black Friday doing for you?
2012-11-24 08:41:10 補充：
yes, it is used as an adjective in this case, that is why you don't write it as "run down", but "run-down".
2012-11-24 09:09:02 補充：
By the way, it can also mean "to knock down", for example:
A pedestrian got run down by a vehicle.
2012-11-24 09:11:28 補充：
or to capture or to chase, for example:
The policeman ran down the suspects
to disparage, for example:
Don't run her down, she is very talented.
2012-11-24 09:12:06 補充：
These are just a few examples, there are more meanings for "run down", you shall base upon the context to see what it really means.
2012-11-24 09:13:08 補充：
I give you these examples, so you would NOT think "run down" only has the meaning in your questioned sentence.