good night

¹ American  

interjection

1. an expression of farewell used in parting at nighttime or when going to sleep.

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good-night ² American  

[good-nahyt] / ˌgʊdˈnaɪt /

noun

1. a farewell or leave-taking.

   He said his good-nights before leaving the party.

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good night British  

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

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good night Idioms  

1. 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]

2. 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]

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Etymology

Origin of good night

Middle English word dating back to 1325–75

Example Sentences

On the red carpet earlier in the night she told me "Win or lose, we're on the booze, so I'm having a good night anyway."

From BBC

It seemed to have been set up as a good night all round for French clubs.

From Barron's

Simple practical things to improve your mood, such as making sure you get a good night's sleep, avoiding too much alcohol or late night parties and maintaining a healthy diet are also important, he says.

From BBC

We amplify 21st century worldly and spiritual conflict, not going gentle into that, or any, good night.

From Los Angeles Times

Tuesday was a very good night for Democrats, but the headlines obscure things that should worry both parties for next year’s midterms.

From The Wall Street Journal