embargo vs red light

embargo

noun
  • A temporary ban on making certain information public. 

  • A heavy burden or severe constraint on action or expenditure. 

  • An order by the government prohibiting ships from leaving port. 

  • A ban on trade with another country. 

verb
  • To impose an embargo on trading certain goods with another country. 

  • To impose an embargo on a document. 

red light

noun
  • Denial to proceed; a ruling out of any possibility. 

  • A warning light, especially as a traffic signal indicating stop. 

  • A sign of a brothel. 

How often have the words embargo and red light occurred in a corpus of books? (source: Google Ngram Viewer )