allure vs preengage

allure

verb
  • To entice; to attract. 

noun
  • The power to attract, entice; the quality causing attraction. 

  • The walkway along the top of a castle wall, sometimes entirely covered and normally behind a parapet; the wall walk. 

preengage

verb
  • To engage previously. 

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