engine room vs gym

engine room

noun

  • The pair of locks in a team. 

  • The front row. 

  • A compartment on a ship in which the engine machinery is located. 

  • The midfield. 

  • The source of power in a team or other group. 

gym

noun

  • A sports facility specialized for lifting weights and exercise. 

  • physical education class 

verb

  • To go to the gym. 

How often have the words engine room and gym occurred in a corpus of books? (source: Google Ngram Viewer )