good-night

¹ American  

[good-nahyt] / ˌgʊdˈnaɪt /

noun

1. a farewell or leave-taking.

   He said his good-nights before leaving the party.

---

good night ² American  

interjection

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

---

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

---

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]

---

Etymology

Origin of good night

Middle English word dating back to 1325–75

Example Sentences

The researchers also observed brain activity patterns that resembled the effects of a good night's sleep, counteracting the typical brain changes associated with sleep deprivation.

From Science Daily

It features celebrities and other well-known personalities reading a short picture book before wishing the audience a good night.

From BBC

“Sometimes the game goes my way, and I have a good night.”

From The Wall Street Journal

It was a conundrum, to be sure, but a good night’s sleep and a tasty breakfast had restored Penelope’s supply of pluck, and she felt more than ready for the challenge.

From Literature

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

From Barron's