The phrase "ran mouth" means to speak excessively or indiscreetly. Antonyms for this phrase might include "kept quiet," "remained silent," "maintained confidentiality," "kept to oneself," or "held one's tongue." When we choose to not "run our mouth," we display a level of discretion and tact that is often admired. By not speaking out of turn or revealing confidential information, we demonstrate respect for other people's feelings and privacy. In today's world, it's easy to overshare and "run our mouth." However, by practicing restraint, we can cultivate richer, more meaningful relationships with those around us.