blue-pencil vs bowdlerize

blue-pencil

verb
  • To edit, especially to censor, written documents. 

  • To use a line-item veto. 

bowdlerize

verb
  • To remove or alter those parts of a text considered offensive, vulgar, or otherwise unseemly. 

How often have the words blue-pencil and bowdlerize occurred in a corpus of books? (source: Google Ngram Viewer )