I had been in touch with the term a few times until I really understood what it meant. Getting into a short trade is a total genius thing. After some reading on the subject, what "really" taught me what a short was is the great friend called @crossholder.
Imagine that you have 10 units of a coin (let's call it 10 shitcoin) and that by analyzing the market you see that the value of that coin is falling ... then you sell that coin (let's assume they are worth 1 bitcoin at the moment) and , after the sale, you wait for the drop to happen ... and actually shitcoin drops (in that theory ... 50%) ... then you repurchase the same 10 units for half the price and get 1/2 bitcoin in the process ... says it's not a master's move ?!