a popular old lullaby (= song sung to make a young child go to sleep). In the US, the name and first line of the song is Rock-a-bye, baby. The tune is similar to Lilliburlero. “Hush-a-bye, baby,On the tree top.When the wind blows,The cradle will rock.When the bough breaks,The cradle will fall,And down will come baby,Cradle and all.”.