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lullaby (n.)
[lullaby 词源字典]
1560s,
lulley by
, from Middle English
lollai, lullay,
from
lullen
(see
lull
(v.)). Second element perhaps from
by-by
"good-by."
[lullaby etymology, lullaby origin, 英语词源]
[lullaby 词源字典]