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 | Từ điển Oxford Advanced Learner 8th 
 
	
		|  lullaby 
  
 
 lul·laby  [lullaby lullabies lullabied lullabying] BrE [ˈlʌləbaɪ]  NAmE [ˈlʌləbaɪ]   noun (pl. lul·labies)
 a soft gentle song sung to make a child go to sleep
 
 Word Origin:
 mid 16th cent.: from  ↑lull  +  bye-bye, a sound used as a refrain in lullabies; compare with  ↑bye-byes.
 
 Example Bank:
 •She sang her baby a lullaby.
 
 
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