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1. A phrase used to wish someone well, as when leaving or going to bed. Good night, honey. Sweet dreams. It was great you see you guys—goodnight!
2. An expression of dismay or annoyance. Good night, Paul—I can't believe you don't know how to change the ink in the printer.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.