overthrow vs rock the boat

overthrow

verb
  • To throw (something) so that it goes too far. 

  • To bring about the downfall of (a government, etc.), especially by force. 

noun
  • A throw that goes too far. 

  • A run scored by the batting side when a fielder throws the ball back to the infield, whence it continues to the opposite outfield. 

  • A removal, especially of a ruler or government, by force or threat of force. 

rock the boat

verb
  • To disturb the status quo or go against rules or conventions, as in an effort to get attention. 

  • I'd just jump in and fix it, but that's not my job, and I don't want to rock the boat. 

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