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good night

good night

68 1.0
A polite phrase for saying goodbye in the evening before sleep
  • noun
  • /ɡʊd naɪt/
: buenas noches
  • You have a good night now, you hear.
  • say good night
  • a good night kiss
  • thank you and good night

OK, well, have a good night.

Examples

Synonyms

goodbye
vsgood night
747 1.0

Words people say when they leave each other

is used specifically in the evening or before sleep rather than all partings
bye-bye
vsgood night
  • Informal
397 1.1

A friendly informal way to say goodbye when leaving

is specific to evening or before sleep rather than any farewell
farewell
vsgood night
194 1.9

A speech or action that says goodbye and wishes someone well

is a polite everyday evening parting phrase rather than a formal expression
goodnight
vsgood night
156 1.0

To wish someone a good night before they go to sleep

is identical in meaning but written as two separate words
night night
vsgood night
  • Baby Talk
68 6.0

A friendly short phrase to say to someone before they go to sleep

is more formal and conventional, not specifically affectionate
to have a good one
vsgood night
  • Informal
23 6.3

Wish someone a nice day or a good time as a friendly goodbye

is used for evening or sleep farewells rather than general well wishes
nighty night
vsgood night
  • Baby Talk
13 8.1

A friendly way to say good night to someone before sleep, often to children

is the polite conventional form rather than a childish phrase
beddy-bye
vsgood night
  • Baby Talk
4 9.1

The time when a child goes to bed to sleep

is a polite conventional farewell rather than a childish bedtime word
good-by
vsgood night
2 4.4

Words or actions people use when they leave each other

is the evening or before sleep farewell rather than any goodbye
nite
vsgood night
  • Informal
1 8.2

A casual way to say goodbye at the end of the day

is the polite conventional spoken form rather than informal writing

How Friendly

sweet dreams
  • Informal
46 1.4
nighty night
  • Baby Talk
13 8.1
don't let the bedbugs bite
  • Baby Talk
2 8.4
sleep of the just
  • Literature
1 8.4
good night
68 1.0

Surface Forms

good night singular
good nights plural

Morphology

good + night

The phrase 'good night' is directly compositional: 'good' modifies 'night' to express a wish for a pleasant night, which naturally yields a farewell/goodwish meaning for bedtime. This pattern is frequent across languages (e.g. buenas noches, bonne nuit) and follows a standard adjective+noun wishing construction, so a B1 learner who knows both words will readily understand it.

Etymology

Good night may come from an older wish like 'God give you a good night.' The words good and night simply mean a 'pleasant night', and people used the short phrase when leaving someone in the evening, so it became a polite way to say 'goodbye' at night.