SO LONG
Meaning of SO LONG in English
I. phrasal
: good-bye
II. sō-ˈlȯŋ, sə- interjection
Etymology: origin unknown
Date: 1854
— used to express farewell
Merriam-Webster's Collegiate English vocabulary.
Энциклопедический словарь английского языка Merriam Webster.
2003