Antonyms for the verb phrase 'ran the mouth' include terms that imply a more restrained or thoughtful approach to communication. Some possible opposite phrases might include 'held one's tongue,' 'chose one's words carefully,' 'kept quiet,' or 'listened actively.' Other phrases that might be considered opposites of 'ran the mouth' include 'remained reserved,' 'used discretion,' 'was introspective,' 'communicated succinctly,' or 'spoke only when necessary.' In contrast to someone who 'ran their mouth,' an individual who chose to employ one of these more measured phrases might be thought of as more thoughtful, considerate, or diplomatic in their approach to communication.