Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • interjection Used to express farewell.
  • adverb Away.
  • adverb To bed; to sleep.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • interjection informal Goodbye.
  • noun colloquial A goodbye.
  • noun colloquial bedtime for a toddler, going to sleep, going to bed.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a farewell remark

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Reduplication of bye.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From bye, goodbye.

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