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Meaning of night-night

night-night

Pronunciation: (interj.nīt'nīt', -nīt"adv.nīt'nīt"), [key]
— interj.
  1. good night.
—adv.
  1. to go to bed or to sleep.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.