gain on vs get past

gain on

verb
  • To encroach on. 

  • To obtain influence with. 

  • To win ground upon; to move faster than, as in a race or contest. 

  • To get the better of; to have the advantage of. 

get past

verb
  • To continue around a blockage; to get around (something); to surpass something that is in the way. 

  • To cause someone to overcome a source of grief or get through a difficult time. 

  • To cause something to get around a blockage; to cause to get around or surpass something that is in the way. 

  • To get through a difficult time; to overcome a source of grief. 

How often have the words gain on and get past occurred in a corpus of books? (source: Google Ngram Viewer )