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I carelessly invested in a stock on a spike near the peak price. How can I salvage my investment?
Yes, you could sell what you have and bet against others that the stock price will continue to fall within a period of time "Shorting".  If you're right, your value goes UP even though the stock price goes down. This is a pretty darn risky bet to make.  If you're wrong, there's no limit to how much money you can owe.  At least with stocks they can only fall to zero!  When you short, and the price goes up and up and up (before the deadline) you owe it! And just as with stocks, someone else has to agree to take the bet.  If a stock is pretty obviously tanking, its unlikely that someone would oppose your bet. (It's probably pretty clear that I barely know what I'm talking about, but I was surprised not to see this listed among the answers.)