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lullaby

[luhl-uh-bahy] /ˈlʌl əˌbaɪ/
noun, plural lullabies.
1.
a song used to lull a child to sleep; cradlesong.
2.
any lulling song.
verb (used with object), lullabied, lullabying.
3.
to lull with or as with a lullaby.
Origin of lullaby
1550-1560
1550-60; equivalent to lulla, lulla(y), interjection used in cradlesongs (late Middle English lullai, lulli) + -by, as in bye-bye
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for lullaby

lullaby

/ˈlʌləˌbaɪ/
noun (pl) -bies
1.
a quiet song to lull a child to sleep
2.
the music for such a song
verb -bies, -bying, -bied
3.
(transitive) to quiet or soothe with or as if with a lullaby
Word Origin
C16: perhaps a blend of lull + goodbye
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for lullaby
n.

1560s, lulley by, from Middle English lollai, lullay, from lullen (see lull (v.)). Second element perhaps from by-by "good-by."

Online Etymology Dictionary, © 2010 Douglas Harper
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