flash-fry vs hot up

flash-fry

verb
  • To fry (food) for a short time at a high heat, typically to brown a coating without overcooking the food inside. 

hot up

verb
  • To become more heated. 

  • To make or become more sexually appealing, enticing or exciting. 

  • To increase in temperature. 

How often have the words flash-fry and hot up occurred in a corpus of books? (source: Google Ngram Viewer )