Informal. good night.
Idioms about night-night
go night-night, Baby Talk. to go to bed or to sleep.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use night-night in a sentence
Make the night night, and the day day, and 40 you will have a pleasant time of it.
"Just a little peep at dainty Miss Mission, to say night-night," he smiled, unfastening the catch on the chronometer case.Gold Out of Celebes | Aylward Edward Dingle
Lie on this, show sup the boon that nick the basting thread thinly and night night gown and pit wet kit.Geography and Plays | Gertrude Stein
night-night, echoed Ted, as he wiggled his fingers in a funny fashion at Trouble.The Curlytops at Silver Lake | Howard Roger Garis
And ''night-night' and 'daddy' were two-year-old language to Jim.Joe Wilson and His Mates | Henry Lawson
British Dictionary definitions for night-night
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