hot air vs waffle

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. 

waffle

noun
  • (Often lengthy) speech or writing that is evasive or vague, or pretentious. 

  • In full potato waffle: a savoury flat potato cake with the same kind of grid pattern. 

  • A concrete slab used in flooring with a gridlike structure of ribs running at right angles to each other on its underside. 

  • A flat pastry pressed with a grid pattern, often eaten hot with butter and/or honey or syrup. 

  • The high-pitched sound made by a young dog; also, a muffled bark. 

  • A type of fabric woven with a honeycomb texture. 

verb
  • To speak or write evasively or vaguely. 

  • Of an aircraft or motor vehicle: to travel in a slow and unhurried manner. 

  • To be indecisive about something; to dither, to vacillate, to waver. 

  • To hold horizontally and rotate (one's hand) back and forth in a gesture of ambivalence or vacillation. 

  • Of a bird: to move in a side-to-side motion while descending before landing. 

  • To smash (something). 

  • Of a dog: to bark with a high pitch like a puppy, or in muffled manner. 

  • Often followed by on: to speak or write (something) at length without any clear aim or point; to ramble. 

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