dangerous vs on thin ice

dangerous

adj
  • Full of danger. 

  • Causing danger; ready to do harm or injury. 

on thin ice

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

adv
  • dangerously, hazardously, delicately 

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