jab vs mainline

jab

verb
  • To give someone an injection 

  • To poke or thrust abruptly, or to make such a motion. 

  • To deliver a quick punch. 

noun
  • A mild verbal insult. 

  • A medical hypodermic injection (vaccination or inoculation) 

  • A quick stab or blow; a poking or thrusting motion. 

  • A short straight punch. 

  • A vaccination, whether or not delivered via conventional injection. 

mainline

verb
  • To inject (a drug) directly into a vein. 

  • To integrate (code, etc.) into the main repository for a software project, rather than separate forks. 

  • To consume voraciously. 

noun
  • In longline fishing the central line to which the branch lines with baits are attached. 

  • An airline's main operating unit, as opposed to codeshares or regional subsidiaries. 

  • The principal route or line of a railway. 

  • A principal vein into which a drug can be injected. 

  • The main repository for a software project, from which different versions (forks) may be split off. 

  • The pipeline carrying wastewater to the public drains or a septic tank. 

adj
  • Normal, principal or standard. 

  • Of or pertaining to the principal route or line of a railway. 

  • Of or pertaining to a surface railway as distinct from an underground, elevated or light rail one. 

  • Of a sequence of opening moves: being part of a main line ("a standard sequence of opening moves considered to be best play"). 

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