abase vs keep under

abase

verb
  • To lower, as in condition in life, office, rank, etc., so as to cause pain or hurt feelings; to degrade, to depress, to humble, to humiliate. 

keep under

verb
  • To hold in subjection; hence, to oppress. 

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