Sentence:  The Bind attribute is used to protect against <WSD>overposting</WSD> attacks by creating a list of safe properties to update; however, as we will discuss later, it does not work as expected and so it is safer to use a different method for editing or creating where some values may be blank.  As an example of <WSD>overposting</WSD>, consider a scenario where the price is submitted as part of the request when a user submits an order for a product. An <WSD>overposting</WSD> attack would attempt to alter this price data by changing the submitted request data in an attempt to buy the product cheaper. 
Meaning of the word marked with <WSD> tags:  To breach security by overwriting data that is not intended for user input.