lullaby
n. countable B1 Intermediate US //ˈɫəɫəˌbaɪ// UK //lˈʌləbˌaɪ// lul·la·by
n. a quiet, gentle song that you sing to a baby to help them fall asleep. It usually has a slow and steady rhythm.
n. a soothing song or piece of music intended to induce sleep, typically performed for children. Often characterized by a repetitive, triple-meter rhythm that mimics the motion of rocking.
She sang a soft lullaby to the baby.
The mother hummed a traditional lullaby until her toddler finally drifted off to sleep.
While many cultures use the lullaby as a functional tool for sleep, composers like Brahms elevated the form into a sophisticated genre of classical piano music.