LULLABY Meaning of LULLABY in English n. & v. --n. (pl. -ies) 1. a soothing song to send a child to sleep. 2 the music for this. --v.tr. (-ies, -ied) sing to sleep. Etymology: as LULL + -by as in BYE-BYE(2) Oxford English vocab. Оксфордский английский словарь. 2012