decided vs on thin ice

decided

noun
  • A voter etc. who has reached their decision. 

adj
  • Clear; unmistakable. 

  • Determined; resolute. 

on thin ice

prep
  • In a dangerous, hazardous, or delicate situation; at risk. 

adv
  • dangerously, hazardously, delicately 

How often have the words decided and on thin ice occurred in a corpus of books? (source: Google Ngram Viewer )