means a temporary pause or interval of calm, especially a brief quieting of noise, activity, or a storm before it resumes

from From Middle English 'lullen,' to quiet a child to sleep — an imitative word, born from the soothing 'lu-lu' sounds nurses crooned over cradles across many languages (compare the Swedish 'lulla' and the Sanskrit 'lolati,' to rock). The sense of a calming hush gradually widened from the baby's bedside to any sudden quiet, and 'lullaby' is its direct descendant, the song the word was first humming.