IPA: /ˈlɛv.əl.ər/
KK: /ˈlɛvələr/
A person or thing that makes something level or equal, often used to describe someone who fights for social equality or fairness.
The leveler fought for the rights of all citizens, demanding equal treatment under the law.
Leveler → It is formed from "level" (from Old French *level*, meaning flat or even) and "-er" (meaning a person who). A leveler is a person who makes something flat or even.
Think of someone who makes things 'flat' or 'even' — that's what a leveler does.