hold the line vs pliable

hold the line

verb
  • To firmly maintain one's viewpoint, principles, or situation; to refuse to change one's practices or plans. 

pliable

adj
  • Easily persuaded; yielding to influence. 

  • Soft, flexible, easily bent, formed, shaped, or molded. 

How often have the words hold the line and pliable occurred in a corpus of books? (source: Google Ngram Viewer )