When there's been a disagreement or conflict, sometimes it's necessary to "smooth things over" with the other party. But there are plenty of ways to convey the same idea with different phrasing. Some phrases that can be used as synonyms for "smooth it over" include "make amends," "patch things up," "bury the hatchet," "resolve the issue," "mend fences," and "reconcile differences." Each of these phrases emphasizes the need to repair or restore a relationship or situation that has been damaged in some way, and can be a useful alternative to "smooth it over" depending on the context and tone of the conversation.