duress vs tiger by the tail

duress

verb
  • To put under duress; to pressure. 

noun
  • Constraint by threat. 

  • Restraint in which a person is influenced, whether by lawful or unlawful forceful compulsion of their liberty by monition or implementation of physical enforcement; legally for the incurring of civil liability, of a citizen's arrest, or of subrogation, or illegally for the committing of an offense, of forcing a contract, or of using threats. 

tiger by the tail

How often have the words duress and tiger by the tail occurred in a corpus of books? (source: Google Ngram Viewer )