ingratiate vs truckle

ingratiate

verb
  • To bring oneself into favour with someone by flattering or trying to please him or her. 

  • To recommend; to render easy or agreeable. 

truckle

verb
  • To act in a submissive manner; to fawn, submit to a superior. 

  • To roll or move upon truckles, or casters; to trundle. 

  • To sleep in a truckle bed. 

noun
  • A small wheel; a caster or pulley. 

  • A truckle bed. 

  • A small wheel of cheese. 

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