so long
interjection Informal.
goodbye: I said so long and left.
Origin of so long
An Americanism dating back to 1840–50
Words nearby so long
so be it,
so far,
so far as,
so far, so good,
so help me,
so long,
so long as,
so many,
so much,
so much as,
so much for
Example sentences from the Web for so long
British Dictionary definitions for so long
so long
sentence substitute
informal
farewell; goodbye
adverb
Southern African slang
for the time being; meanwhile
Idioms and Phrases with so long
so long
Good-bye, as in So long, we'll see you next week. The allusion here is puzzling; long presumably means “a long time” and perhaps the sense is “until we meet again after a long time,” but the usage has no such implication. [Colloquial; first half of 1800s]