eyewash vs talk through one's hat

eyewash

verb
  • To fool with nonsense or flattery. 

  • To keep information secret by sending false information to many people in one's own organization, and correct information to a select few. 

noun
  • A soothing medicated lotion for the eyes. 

  • Nonsense, flattery, or pretentiousness. 

  • The washing out of the eyes with copious water (usually water alone) to quickly remove an irritant, as for example in laboratories and industrial plants. 

talk through one's hat

verb
  • To assert something as true or valid; to bluff. 

  • To speak lacking expertise, authority, or knowledge; to invent or fabricate facts. 

How often have the words eyewash and talk through one's hat occurred in a corpus of books? (source: Google Ngram Viewer )