Division of labour means the separation of the work process into a number of tasks, with each task performed by a separate person or group of persons. So when we say there is a sexual (or gender) division of labour is when different tasks done by men and women.
Sources: https://www.britannica.com/topic/division-of-labour and https://en.wikipedia.org/wiki/Sexual_division_of_labour
Division du travail – Comment le travail est séparé entre les membres d’une société ou d’un groupe.
