microwave vs warm over

microwave

verb
  • To cook (something) in a microwave oven. 

  • To provide minimal preparation for implementation, deeming full or extensive preparation as unnecessary. 

noun
  • An electromagnetic wave with wavelength between that of infrared light and radio waves. 

warm over

verb
  • To reheat food that was previously cooked 

How often have the words microwave and warm over occurred in a corpus of books? (source: Google Ngram Viewer )