strong-arm vs white knight

strong-arm

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

verb
  • To coerce, to muscle. 

  • To bully; to intimidate. 

adj
  • Bullying; extortionate. 

  • Coercive, employing force. 

white knight

noun
  • Someone who unnecessarily defends someone else. 

  • An individual or corporation that intends to acquire another company in order to avert a hostile takeover. 

  • A man who defends a woman in debate etc. in an attempt to gain her favour. 

  • A mushroom of species Tricholoma album. 

  • A hero, savior, or righteous individual. 

verb
  • To unnecessarily defend someone, especially in an attempt to gain favour. 

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