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]

The noun has one meaning:

Meaning #1: a farewell remark
  Synonyms: adieu, adios, arrivederci, auf wiedersehen, au revoir, bye, bye-bye, cheerio, good-by, goodby, good-bye, goodbye, good day, sayonara

Look up so long in Wiktionary, the free dictionary.

So Long is an idiomatic expression meaning goodbye, and it may also refer to:

• "So Long" (song), a 1974 single by ABBA
• "So Long", a song by Everlast from the soundtrack of the 1999 film End of Days
• "So Long", a song by Guster from their 1999 album Lost and Gone Forever
• "So Long", a song by Krokus from their 2006 album Hellraiser
• "So Long" a song by Fischer-Z
• "So Long", a song by Rilo Kiley from their 2002 album The Execution of All Things
• "So Long", a 2006 song by MC Hammer

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