boomerang vs tear gas

boomerang

noun
  • A breakdancing move in which the performer walks on their hands while keeping the legs raised off the ground. 

  • A device for changing the color of a followspot. 

  • A flat curved airfoil that spins about an axis perpendicular to the direction of flight, originally used in various parts of the world as a hunting weapon or, in returnable types, for sports or training. 

  • An early return of an aircraft whose mission was aborted, often due to technical failures. 

  • A boomerang kick. 

verb
  • To return or rebound unexpectedly, especially when the result is undesired; to backfire. 

  • To travel in a curved path. 

  • To abort a mission and return to base early. 

tear gas

verb
  • To use tear gas. 

noun
  • Any lachrymatory, non-lethal chemical compound that causes the eyes to sting and water and/or irritates the respiratory system, mostly used for controlling crowds during riots or as self-defense. 

How often have the words boomerang and tear gas occurred in a corpus of books? (source: Google Ngram Viewer )