Origin of nighty-nightreduplicated, reduplication
A mother gives her child a nighty night kiss.
Nighty-night is defined as a baby-talk word that means "good night."
An example of nighty night is what you might say to your son as you tuck him into bed.
Variant of night-night
Origin of nighty-nightReduplication of night -y 3
- (colloquial, usually childish) Alternative spelling of nighty night.
- (colloquial, usually childish) Good night.
- She looked back and with a finger wave of two chubby digits and called, "Nighty-night. Time to visit the planet Draghow!"