elbow bump vs obliquity

elbow bump

noun
  • A hit or jab made with the elbow. 

  • A hit to the elbow; also, an injury to the elbow caused by such a hit. 

  • The touching of elbows between two people, sometimes as an alternative to a handshake, fist bump, or other form of contact when attempting to avoid the spread of germs. 

obliquity

noun
  • Axial tilt. 

  • Mental or moral deviation or perversity; immorality. 

  • The quality of being obscure, oftentimes willfully, sometimes as an exercise in euphemism. 

  • The quality of being oblique in direction, deviating from the horizontal or vertical; or the angle created by such a deviation. 

How often have the words elbow bump and obliquity occurred in a corpus of books? (source: Google Ngram Viewer )