From Middle English lullen, lollen. Originally, perhaps expressive in origin from la-la-la or lu-lu-lu sounds made in calming a child. Compare Finnish laulaa (to sing) and Hiligaynon lala (to sing a lullaby).
Cognate with Scots lul, lule, loll, Dutch lollen ("to sing badly, caterwaul"), Dutch lullen ("to chatter, prate, cheat, deceive"), Low German lullen ("to lull"), German lullen ("to lull"), Danish lulle ("to lull, sing to sleep"), Swedish lulla ("to lull"), Icelandic lulla ("to lull").
Modern English dictionary
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