good nightgood night
Good night is defined as a pleasant expression said at the end of the day.
An example of good night is when a wife says to her husband when she shuts out the light and they both go to sleep.
a phrase used as a farewell at night in parting or going to bed
Used to express an acknowledgment of parting at night or of going to bed.
- Good Thing
Probably a shortening of "May you have a good night."