eyewash vs hot air

eyewash

noun
  • Nonsense, flattery, or pretentiousness. 

  • A soothing medicated lotion for the eyes. 

  • 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. 

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

  • To fool with nonsense or flattery. 

hot air

noun
  • Empty, confused, or exaggerated talk lacking meaning or substance; bluster. 

  • Air that has been heated, especially so as to function as the lifting agent of a hot-air balloon. 

How often have the words eyewash and hot air occurred in a corpus of books? (source: Google Ngram Viewer )