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New American Oxford Dictionary

bye-byes

bye-byes ▶noun [ mass noun ] a child's word for sleep. ORIGIN mid 19th cent.: from the sound bye-bye, long used as a refrain in lullabies.

 

Oxford Dictionary

bye-byes

bye-byes ▶noun [ mass noun ] a child's word for sleep. ORIGIN mid 19th cent.: from the sound bye-bye, long used as a refrain in lullabies.