retrofit vs rig

retrofit

verb
  • To give new characteristics or make alterations (to someone or something) to suit them to changed circumstances. 

  • To supply (a device, structure, etc.) with new components or parts that were not previously available or installed; to modernize. 

  • Synonym of backport (“to retroactively supply a fix or feature to a previous version of a software product at the same time or after supplying it to the current version.”) 

  • To supply a device, structure, etc., with new components or parts that were not previously available or installed. 

  • To add or substitute (new components or parts) that were not previously available for or installed in a device, structure, etc. 

noun
  • An act of supplying a device, structure, etc., with new components or parts that were not previously available or installed; a retrofitting. 

  • A change made to a device, structure, etc., by introducing components or parts that were not previously available or installed. 

rig

verb
  • To make or construct something in haste or in a makeshift manner. 

  • To move (a heavy object) with the help of slings, hoists, block and tackle, levers, or similar equipment. 

  • To dress or clothe in some costume. 

  • To manipulate something dishonestly for personal gain or discriminatory purposes. 

  • To equip and fit (a ship) with sails, shrouds, and yards. 

  • To outfit a model with controls for animation. 

noun
  • Special equipment or gear used for a particular purpose. 

  • An imperfectly castrated horse, sheep etc. 

  • A model outfitted with parameterized controls for animation. 

  • Radio equipment, especially a citizen's band transceiver. 

  • A costume or an outfit. 

  • A ridge. 

  • A promiscuous woman. 

  • An algebraic structure similar to a ring, but without the requirement that every element have an additive inverse. 

  • The special apparatus used for drilling wells. 

  • The rigging of a sailing ship or other such craft. 

  • A large truck such as a semi-trailer truck. 

  • A personal computer, typically one modified for looks. 

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