interjection
- Informal. good night.
- go night-night, Baby Talk. to go to bed or to sleep.
sentence substitute
- an informal word for good night
nursery talk, “good-night,” 1896; form nighty-night is attested from 1876.
interjection
sentence substitute
nursery talk, “good-night,” 1896; form nighty-night is attested from 1876.