angel vs earn one’s keep

angel

noun
  • An incorporeal and sometimes divine messenger from a deity, or other divine entity, often depicted in art as a youthful winged figure in flowing robes. 

  • An altitude, measured in thousands of feet. 

  • A person having the qualities attributed to angels, such as purity or selflessness. 

  • An angel investor. 

  • One of the lowest order of such beings, below virtues. 

  • The person who funds a show. 

  • A person who has Angelman syndrome. 

  • An English gold coin, bearing the figure of the archangel Michael, circulated between the 15th and 17th centuries, and varying in value from six shillings and eightpence to ten shillings. 

verb
  • To support by donating money. 

earn one’s keep

How often have the words angel and earn one’s keep occurred in a corpus of books? (source: Google Ngram Viewer )