Yap away is an idiom that generally refers to someone talking non-stop or incessantly. There are numerous synonyms that can be used as replacements for this phrase such as chatter, gab, jabber, blabber, prattle, rattle, and murmur. These words capture the essence of the original meaning and can be used in a variety of contexts. Some other synonyms for yap away include rant, rave, blather, and babble. These terms generally imply a lack of focus or coherence in the speaker's message. Nevertheless, all of these synonyms for yap away can be used to describe a person who is speaking at great length, often without stopping.