keep on at vs scold

keep on at

scold

verb
  • Of birds, to make harsh vocalisations in aggression. 

  • Of birds, to make vocalisations that resemble human scolding. 

  • To rebuke angrily. 

noun
  • A person who habitually scolds, in particular a troublesome and angry woman. 

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