The phrase "stand to reason" means that something is logical, reasonable, or makes sense. There are several synonyms that can be used in place of "stand to reason," including "be logical," "be rational," "be reasonable," "be sensible," and "make sense." These phrases indicate that the statement in question is based on facts, evidence, or common sense, and it follows a logical train of thought. Other related phrases include "it follows that," "it is evident that," and "it's only natural that." Using these synonyms can add variety to your writing and help convey the same meaning in a more interesting and engaging way.