hang-up vs repression

hang-up

noun
  • An emotional difficulty or a psychological inhibition; a complex. 

  • An unforeseen obstacle to progress; a hitch or delay. 

repression

noun
  • The involuntary rejection from consciousness of painful or disagreeable ideas, memories, feelings, or impulses. 

  • The act of repressing; state of being repressed. 

How often have the words hang-up and repression occurred in a corpus of books? (source: Google Ngram Viewer )