means A list of people and their assigned duties, turns, or positions — who's doing what, and when.

from From the Dutch 'rooster,' meaning a gridiron or grate — the kind of crisscrossing iron bars you'd cook over. Because ruled paper laid out in lines and squares looked just like that grid, the Dutch borrowed the word for any table or schedule drawn in such a grid. English picked it up around the early 18th century, and the gridiron quietly became a list of names.