To calm or soothe someone into sleep or relaxation, or a temporary pause in activity or noise.
From Middle English 'lullen,' possibly from Old Norse 'lulla' (to sing a lullaby) or imitative of soothing sounds like 'luh-luh.' The exact origin is uncertain but likely connected to baby-soothing sounds across Germanic languages.
The onomatopoeia 'lull' mimics the actual sounds parents make to calm babies—'luh, luh, luh'—which is why it works so well in lullabies. It's a word that sounds like what it does!
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