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good night

noun
1.
an expression of farewell used in parting at nighttime or when going to sleep.
Origin
1325-1375
1325-75; Middle English

good-night

[goo d-nahyt] /ˌgʊdˈnaɪt/
noun
1.
a farewell or leave-taking:
He said his good-nights before leaving the party.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for good-night

good night

sentence substitute
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Slang definitions & phrases for good-night

good night

interjection

An exclamation of surprise, irritation, emphasis, etc: Good night! Must you chew that gum so loud?

[1880s+; a euphemism for good God]


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Idioms and Phrases with good-night

good night

.
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 ]
.
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® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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