There are several synonyms for the phrase "settle differences". One of the most common ones is "resolve conflicts". This phrase is often used when two or more parties are experiencing disagreements or disputes that require an intervention or resolution. Another synonym is "reconcile", which signifies the act of finding a common ground and restoring harmony between two conflicting parties. "Mediate" is another synonym, which refers to the act of bringing two conflicting parties towards a mutually acceptable solution. Other synonyms include "negotiate", "arbitrate", "settle a dispute", and "make peace". All these synonyms emphasize the idea of finding a resolution or a peaceful solution to a dispute or disagreement.