foot dragging vs interference

foot dragging

interference

verb
  • To interfere. 

noun
  • The act of interfering with something, or something that interferes. 

  • The illegal obstruction of an opponent in some ball games. 

  • An effect caused by the superposition of two systems of waves. 

  • In United States patent law, an inter partes proceeding to determine the priority issues of multiple patent applications; a priority contest. 

  • The interruption of the line between an attacked piece and its defender by sacrificially interposing a piece. 

  • The situation where a person who knows two languages inappropriately transfers lexical items or structures from one to the other. 

  • A distortion on a broadcast signal due to atmospheric or other effects. 

How often have the words foot dragging and interference occurred in a corpus of books? (source: Google Ngram Viewer )