Blather on is a phrase used to describe someone who talks excessively and without purpose. The crossword solutions for this phrase are 'PRATE' (5 letters) and 'BABBLE' (6 letters). PRATE is defined as talking in an idle or foolish manner, while BABBLE is defined as speaking rapidly and continuously in a foolish or meaningless way. Both words are used to describe someone who talks too much and without any real purpose.