keep changing one's mind vs teeter

keep changing one's mind

teeter

verb

  • To be close to becoming a typically negative situation. 

  • To tilt back and forth on an edge. 

  • To be indecisive. 

noun

  • A teeter-totter or seesaw. 

How often have the words keep changing one's mind and teeter occurred in a corpus of books? (source: Google Ngram Viewer )