noun, phrase ·Rare ·Advanced level

Definitions

Noun

1. 1
   Alternative spelling of nightie. alt-of, alternative

Phrase

1. 1
   Good night; abbreviation of nighty night. childish

Synonyms

All synonyms

gownnight-robenightdressnightgownnightgown

Example

More examples

"Nighty night, time to hit the sack."

Etymology

Etymology 1

From night + -y (diminutive suffix).

Etymology 2

From night + -y (suffix forming colloquialisms).

Related phrases

good night

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.