Being a chatterbox is a phrase used to describe someone who talks a lot. The term can be broken down into three crossword solutions: YAK (3 letters), JABBER (6 letters), and GAB (3 letters). YAK is an informal verb meaning to talk rapidly and incessantly. JABBER is another informal verb meaning to talk rapidly and continuously in a foolish or excited manner. Finally, GAB is an informal verb meaning to talk in a lighthearted and friendly way. All three words are used to describe someone who talks a lot and often without thinking.