blip vs blue pencil

blip

verb
  • To change state abruptly, such as between off and on or dark and light, sometimes implying motion. 

  • Synonym of bleep (“to replace offending words in a broadcast recording with a tone”) 

noun
  • A small dot registered on electronic equipment, such as a radar or oscilloscope screen. 

  • A brief and usually minor aberration or deviation from what is expected or normal. 

  • A short sound of a single pitch, usually electronically generated. 

  • An individual message or document in the Google Wave software framework. 

blue pencil

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