A peacemaker is someone who helps end conflicts or arguments between people.
You might hear about a peacemaker at work who steps in to resolve a disagreement between coworkers, or maybe your family has one member who's always trying to calm down the arguing kids and parents. Being a peacemaker often means listening carefully to both sides of an issue and finding common ground that everyone can agree on.
One who sets the pace in a race, to guide the others.
A person who restores peace, especially by settling disputes.
