To relegate or assign (something) to a less insignificant status; diminish.
To treat (someone) in a slighting manner.
To make (something) smaller or as small as possible; shrink; reduce.
To remove (a window) from the main display area, collapsing it to an icon or caption.
To underestimate the value of something.
To engage in the process of short selling (selling a stock one does not own on the premise of the stock's price going down).