What is another word for running on at the mouth?
Pronunciation: [ɹˈʌnɪŋ ˌɒn at ðə mˈa͡ʊθ] (IPA) 
The phrase "running on at the mouth" is typically used to describe someone who talks excessively and often about unimportant or irrelevant topics. Synonyms for this phrase include talking too much, blathering, jabbering, prattling, rambling, and babbling. Each of these words has a slightly different connotation, but all convey the idea of someone who is unable to stop talking. Other synonyms for "running on at the mouth" include yakking, chattering, gabbing, and spouting. All of these words suggest that the speaker is talking at great length without really saying anything of substance. The best way to deal with someone who is "running on at the mouth" is to simply tune them out and move on.
