Dictionary.com
definitions
  • synonyms

night-night

[interjection nahyt-nahyt, -nahyt; adverb nahyt-nahyt]
See more synonyms on Thesaurus.com
interjection
  1. Informal. good night.
Idioms
  1. 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
British Dictionary definitions for go night-night

night-night

sentence substitute
  1. an informal word for good night
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

Word Origin and History for go night-night

night-night

nursery talk, "good-night," 1896; form nighty-night is attested from 1876.

Online Etymology Dictionary, © 2010 Douglas Harper