noun
a quiet, gentle song sung to send a child to sleep
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The mother sang a soothing lullaby to her baby before putting him to sleep.
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I always play a lullaby on my phone to help me relax and fall asleep.
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My grandma used to hum a lullaby to help me doze off when I was a kid.
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The gentle sound of the waves crashing against the shore was like a lullaby to her troubled mind.