Posted by rfvv on Wednesday, September 1, 2010 at 9:04pm.
To let someone down is an idiom.
http://idioms.thefreedictionary.com/let+down
The word "down" is an adverb, and in this sense it's part of an idiom, too. The whole idiom means to disappoint.
You can find more help with phrasal verbs and idioms here:
http://www.eslcafe.com/students/
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