good night

good night idiom
  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.

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