forearm vs threaten

forearm

noun
  • The part of the arm between the wrist and the elbow. 

  • A section of the weapon between the receiver and the muzzle, used to hold the firearm steady. 

verb
  • To arm in preparation. 

threaten

verb
  • To portend, or give a warning of. 

  • To call into question the validity of (a belief, idea, or viewpoint); to challenge. 

  • He threatened me with a knife. 

  • To make a threat against someone; to use threats. 

  • To menace, or be dangerous. 

  • To be close to equaling or surpassing (a record, etc.) 

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