anger vs chip on one's shoulder

anger

noun
  • A strong feeling of displeasure, hostility or antagonism towards someone or something, usually combined with an urge to harm, often stemming from perceived provocation, hurt, or threat. 

verb
  • To become angry. 

  • To cause such a feeling of antagonism in. 

chip on one's shoulder

noun
  • A habitually combative attitude, usually because of a harboured grievance, sense of inferiority, or having something to prove. 

  • A tendency to take offence quickly. 

  • A form of challenge, in the same spirit as a medieval knight throwing down his gauntlet. 

How often have the words anger and chip on one's shoulder occurred in a corpus of books? (source: Google Ngram Viewer )