on thin ice vs settled

on thin ice

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

adv
  • dangerously, hazardously, delicately 

settled

adj
  • Comfortable and at ease, especially after a period of change or unrest. 

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