bitter pill vs menace

bitter pill

noun
  • Used other than figuratively or idiomatically: see bitter, pill. 

menace

noun
  • A perceived threat or danger. 

  • An annoying and bothersome person or thing. 

  • The act of threatening. 

verb
  • To endanger (someone or something); to imperil or jeopardize. 

  • To threaten (an evil to be inflicted). 

  • To make threats against (someone); to intimidate. 

How often have the words bitter pill and menace occurred in a corpus of books? (source: Google Ngram Viewer )