Level the playing field
Definition 1 of 1
Pro Tip 1/3Sports Origin
Originally from sports, where it means ensuring no team has an unfair advantage. 
The referee's role is to level the playing field, so no side has a head start.
Pro Tip 2/3Metaphorical Use
Used metaphorically in various contexts like business, politics, and education to indicate fairness. 
Grant programs level the playing field for students from less affluent backgrounds.
Pro Tip 3/3Not Literal
Doesn't mean changing an actual field or place, but refers to making opportunities fair. 
Our community center levels the playing field by providing free internet access to everyone.