The phrase "reverse course" means to change direction or go back on a decision or plan that was previously made. It implies a complete turnaround or moving in the opposite direction of what was originally intended. Full definition
This means that two - thirds of districts with cuts reversed course on reforms. (jackjenningsdc.com)
These activities won't reverse the course of the disease. (health.com)
Stocks sometimes trade higher (or lower) heading into «major» news announcements before reversing course immediately following the event. (simplysafedividends.com)