[interjection nahyt-nahyt, -nahyt; adverb nahyt-nahyt]
- Informal. good night.
- go night-night, Baby Talk. to go to bed or to sleep.
Origin of night-night
First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- an informal word for good night
nursery talk, "good-night," 1896; form nighty-night is attested from 1876.
Online Etymology Dictionary, © 2010 Douglas Harper