keep under thumb vs overbear

keep under thumb

overbear

verb
  • To push through by physical weight or strength; to overwhelm, overcome. 

  • To produce an overabundance of fruit. 

  • To prevail over; to dominate, overpower; to oppress. 

How often have the words keep under thumb and overbear occurred in a corpus of books? (source: Google Ngram Viewer )