“Goodbye!“ is “Da svidaniya!” (“До свидания!”) in Russian. It’s a polite formula. We say, “Da svidaniya!” when we take leave of somebody and leave him indefinitely. It’s an analog of “See you!” or “Till next time!” but it’s used in official situations. This expression started being used in speech since the beginning of the nineteenth century. By saying “Da svidaniya!” we wish to see a person soon.