[1895–1900]This word is first recorded in the period 1895–1900. Other words that entered Englishat around the same time include: calling card, cutback, flamenco, frame of reference, freewheel
Examples of 'night-night' in a sentence
night-night
No more muttering 'night-night, darling' before deeply entering, er, the land of nod.
Times, Sunday Times (2007)
Bedtimes are up for negotiation, with 16 per cent of under-11s choosing what time they say night-night.