Hold. Also depends on what price you bought it at and whether it pays to sell now and then buy something that is also down. Like buy NOK at 3.98, very good price, could down more, but you might get more bang for your dollar. Don't buy NOK or any other company until you get to know it and get more comfortable with it. You may not like NOK, which is ok and understandable, but it is an example.
Personally, I like NOK and where it could go, but that is besides the point. The idea about investing is to make money and no other reason. You may need to take a loss, to possibly go forward. I've learned the hard way. I like WFM, but I sold that sucker and made 50% on it. Take the ego out and move forward - it is about making money baby.