act on vs strong-arm

act on

verb
  • To take action against something. 

  • To affect something. 

  • To act decisively on the basis of information received or deduced. 

  • Το act accordingly to a (usually sublimated) desire or impulse. 

strong-arm

verb
  • To bully; to intimidate. 

  • To coerce, to muscle. 

noun
  • A person who threatens or intimidates others, especially on behalf of somebody else; a goon or enforcer. 

adj
  • Bullying; extortionate. 

  • Coercive, employing force. 

How often have the words act on and strong-arm occurred in a corpus of books? (source: Google Ngram Viewer )