What is tinder swipe left gone forever?

When on Tinder, swiping left on a user's profile means that you are not interested in them. Once you swipe left, that user's profile will disappear from your stack of potential matches and you will not be able to see or interact with it again. This is the general mechanism of the app's swiping interface and it helps to streamline the matching process by presenting users with only the profiles they are more likely to be interested in. However, you can purchase a paid version of the app called Tinder Plus, which allows you to undo a left swipe and revisit profiles you may have accidentally dismissed.