double talk vs plain English

double talk

noun
  • Speech which combines English (or some other language) and native-sounding gibberish for humorous effect. 

  • Doublespeak. 

  • Lies, especially in a formal political statement. 

  • A situation when two people talk at the same time, causing overlapping audio signals. 

  • A simple phonetic code with a regular infix that makes meaningful speech sound unintelligible. 

plain English

noun
  • English that does not use any jargon or technical / scientific terminology. 

How often have the words double talk and plain English occurred in a corpus of books? (source: Google Ngram Viewer )