rock the boat vs upset the apple cart

rock the boat

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

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

upset the apple cart

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