noun
lullaby
LUH-luh-beye
noun
1
A soft, soothing song sung to help a child fall asleep.
"She hummed a lullaby until the baby drifted off."
verb
1
To sing a lullaby to someone.
"He lullabied his daughter every night before bed."
How to Use Lullaby
Learner’s notesIn plain EnglishA gentle song for sending a child to sleep.
Common pairings
sing a lullaby
Word Forms
lullabied past tense, lullabies plural, lullabies singular
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Etymology
Formed from lull plus an old interjection "bye" used to soothe children — first recorded around 1560.