Hi Jeanne. Shorting a stock is when you "borrow" shares to sell now, hoping that you can buy replacements to cover those that were loaned to you for a cost, later, and at a better price.
It is a risky move being that you can lose 100s of percent if the stock sky rockets and you are forced to cover those loans at a much higher cost per share.
X short volume is up from 20k shares on Friday to 120k shares today. That's not really a lot of shares being shorted on EDXC and for good reason.