From Longman Dictionary of Contemporary Englishlullabylul‧la‧by /ˈlʌləbaɪ/ noun (plural lullabies) [countable] APMCHILDa slow quiet song sung to children to make them go to sleep
Examples from the Corpus
lullaby• White noise is as safe as a lullaby.• She said that all night long, like a lullaby, sometimes shaking me to keep me from nodding off.• Somewhere in a room above them, a woman gently crooned the tune of a lullaby.• It was a lullaby with simple words and a complex, Oriental-sounding tune.• So was a lullaby, played on a guitar.• It is carried on through the medium of lullabies.• Penfield got many reports of lullabies and classical music, too.• C.; they were sung about in Sumerian lullabies.Origin lullaby (1500-1600) lulla word used to make a child calm or sleepy ((15-18 centuries)) + bye word used to make a child sleepy ((15-20 centuries)) 