If the price goes up above 1.2000 the trade becomes a winning one potentially. Let's suppose the price goes up to 1.2100. You may want to move your stop loss level up to place it in between 1.2000 an 1.2100, this way you will be sure the trade will be closed in profit, whatever the price will do later. This action of moving the stoploss level is called trailing the stop. It can be done manually, or maybe your trading software allows you to set up an automatic trailing method as the price moves.