an expression of farewell used in parting at nighttime or when going to sleep.
Origin
1325-75;Middle English
good-night
[goo d-nahyt] /ˌgʊdˈnaɪt/
noun
1.
a farewell or leave-taking:
He said his good-nights before leaving the party.
Examples from the web for good night
Natural, organic bed linens can help you to get a good night's sleep.
Most people need only leave enough time in their busy schedules to get a good night's sleep.
New results challenge the view that a good night's sleep can leave behind a dense bloom of brain cells in the morning.
But they did much better the next morning after getting a good night's sleep.
To study the brain waves of a good night's sleep, scientists invited volunteers to snooze in the lab.
Have a good night, and thank you for the conversation.
Before going to sleep he called her and wished her good night.
When tested on new facts, people remember them better after a good night's sleep than after a short break.
On a good night, he'd get a page written, and he'd be a few hundred words closer to finishing.
Of course, s/he did not go gentle into that good night.
British Dictionary definitions for good night
good night
sentence substitute
1.
a conventional expression of farewell, or, rarely, of greeting, used in the late afternoon, the evening, or at night, esp when departing to bed
Slang definitions & phrases for good night
good night
interjection
An exclamation of surprise, irritation, emphasis, etc: Good night! Must you chew that gum so loud?
[1880s+; a euphemism for good God]
Idioms and Phrases with good night
good night
.
Expression of farewell used when parting at night or when going to sleep, as in He stood at the door, saying good night to each of the departing guests, or Mother came to tuck the children in and kiss them good night. [ Late 1300s ]
.
Exclamation of surprise or irritation, as in Good night, Joe!—You can't mean what you said, or Good night, Anne—it's time you learned how to throw a ball. [ Late 1800s ]