fill in vs hold back

fill in

verb
  • To fill; to replace material that is absent or has been removed. 

  • To substitute for somebody or something. 

  • To complete a form or questionnaire with requested information. 

  • To beat up; to physically assault. 

  • To inform somebody, especially to supply someone missing or missed information. 

hold back

verb
  • To contain; stop. 

  • To act with reserve; to contain one's full measure or power. 

  • To delay the progress of, especially in school. 

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