promotion vs shot in the arm

promotion

noun
  • An event intended to increase the reach or image of a product or brand. 

  • Transformation of a pawn into a piece (by reaching the opponent's back rank). 

  • Dissemination of information in order to increase its popularity. 

  • Forward motion. (Contrast remotion.) 

  • An advancement in rank or position. 

shot in the arm

noun
  • A stimulus; a boost in energy, morale, or well-being. 

  • An injection of a drug into the arm, whether for medical or recreational purposes. 

How often have the words promotion and shot in the arm occurred in a corpus of books? (source: Google Ngram Viewer )