- Informal. good night.
- go night-night, Baby Talk. to go to bed or to sleep.
Origin of night-night
Examples from the Web for night-night
Historical Examples of night-night
And ''night-night' and 'daddy' were two-year-old language to Jim.Joe Wilson and His Mates
Night-night, echoed Ted, as he wiggled his fingers in a funny fashion at Trouble.The Curlytops at Silver Lake
Howard Roger Garis
"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
- an informal word for good night
nursery talk, "good-night," 1896; form nighty-night is attested from 1876.