Night-night
[interjection nahyt-nahyt, -nahyt; adverb nahyt-nahyt] /interjection ˈnaɪtˈnaɪt, -ˌnaɪt; adverb ˈnaɪtˌnaɪt/
interjection
1.
Informal. good night.
Idioms
2.
go night-night, Baby Talk. to go to bed or to sleep.
sentence substitute
1.
an informal word for good night
nursery talk, “good-night,” 1896; form nighty-night is attested from 1876.
interjection
An amiable parting salutation at night (1896+)
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