"To share the workload" means to divide the tasks and responsibilities with others so that everyone is doing their fair share of the work. Full definition
If an employee works on a number of group projects, he or she needs to be able to get along well with others, sharing the workload with colleagues to complete a goal. (thebalance.com)
Since I am trained in providing teaching assistance, I can work diligently in sharing the workload of the lead teacher by providing both instructional and clerical support. (coverlettersandresume.com)
Two control units, sharing the workload in a master / slave principle, manage events in the engine. (thetorquereport.com)