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

He said good night to Captain, locked the gate, and headed for the warmth of his cottage.

From Literature

“But don’t you already know if you’ve had a good night’s sleep?” you or my husband might ask.

From The Wall Street Journal

Feeling like you had "a good night's sleep" depends on more than just how long you slept.

From Science Daily

“Believe me, all will be well, Elizabeth. Now let us go inside, and say our good nights to Papi.”

From Literature

I boarded after a good night’s sleep and landed in London in time for a late dinner.

From The Wall Street Journal