nighty-night

[ nahy-tee-nahyt ]
/ ˈnaɪ tiˈnaɪt /

interjection Informal.

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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. 2020

Example sentences from the Web for nighty-night

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

    Babbitt|Sinclair Lewis