Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: lulla word used to make a child calm or sleepy (15-18 centuries) + bye word used to make a child sleepy (15-20 centuries)

lullaby

 noun
     
Related topics: Music
lul‧la‧by plural lullabies [countable]
APM a slow, quiet song sung to children to make them go to sleep
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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