/lul"euh buy'/ , n. , pl. lullabies , v. , lullabied, lullabying .
n.
1. a song used to lull a child to sleep; cradlesong.
2. any lulling song.
v.t.
3. to lull with or as with a lullaby.
[ 1550-60; equiv. to lulla, lulla ( y ), interj. used in cradlesongs (late ME lullai, lulli ) + -by, as in BYE-BYE ]