gateway vs revolving door

gateway

noun
  • An entrance capable of being blocked by use of a gate. 

  • A point at which freight moving from one territory to another is interchanged between transportation lines. 

  • In wireless internet, an access point with additional software capabilities such as providing NAT and DHCP, which may also provide VPN support, roaming, firewalls, various levels of security, etc. 

  • A place regarded as giving access to somewhere. 

  • Any point that represents the beginning of a transition from one place or phase to another. 

  • Any thing or area of interest that tends to lead to deeper involvement. 

verb
  • To make available via a gateway, or access point. 

revolving door

noun
  • A door that rotates around a central pivot. 

  • A movement of personnel between roles as legislators and regulators, on the one hand, and members of the industries affected by the legislation and regulation, on the other. 

  • A system or institution in which people exit and immediately reenter. 

  • Synonym of recidivism 

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