employ vs pink slip

employ

noun
  • The state of being an employee; employment. 

verb
  • To hire (somebody for work or a job). 

  • To use (somebody for a job, or something for a task). 

  • To make busy. 

pink slip

noun
  • Notice of termination of employment. 

  • An automobile roadworthiness inspection certificate. 

  • The title document for an automobile. 

verb
  • To terminate the employment of. 

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