plough into vs run into

plough into

verb
  • To crash into something. 

  • To engage in some activity with vigor. 

  • To invest a resource (money, material, energy) into something. 

run into

verb
  • To cause to collide with. 

  • To collide with. 

  • To enter by running. 

  • To unexpectedly encounter or meet someone or something (literally or figuratively). 

  • To blend into; to be followed by or adjacent to without there being a clear boundary. 

  • To cause to blend into. 

  • To reach a large figure. 

How often have the words plough into and run into occurred in a corpus of books? (source: Google Ngram Viewer )