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nighty-night

[nahy-tee-nahyt]
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interjection Informal.
  1. good night.
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Origin of nighty-night

1875–80; reduplication of (good) night; see -y2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for nighty-night

Historical Examples

  • If you're a good boy, maybe I'll kiss you when we say nighty-night.

    Babbitt

    Sinclair Lewis