so long

See synonyms for so long on Thesaurus.com
interjectionInformal.
  1. goodbye: I said so long and left.

Origin of so long

1
An Americanism dating back to 1840–50

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use so long in a sentence

  • “So-long, kid,” he called, as his head sank to the level of the sidewalk.

    Vistas of New York | Brander Matthews

British Dictionary definitions for so long

so long

sentence substitute
  1. informal farewell; goodbye

adverb
  1. Southern African slang for the time being; meanwhile

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other 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]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.