What does the phrase blathered means

'Blather' is not a phrase; it is a one-word verb.

It means to talk on and on and on and not say anything meaningful.

Explanation:

I could start blathering right now about the importance of your building a big vocabulary, but I won't so as not to bore you to death.  :)

if you want me to check your answer i agree with what you put. i read the story