roll down vs unspool

roll down

verb
  • Synonym of wind down 

unspool

verb
  • To lose or cause to lose one's composure; to fall apart. 

  • To screen a film. 

  • To remove (film, cotton, etc.) from a spool; unwind. 

  • To reduce the thrust of a jet engine to idle in flight. 

  • To relax; to unwind. 

  • To flow forth, unfold, or play out. 

How often have the words roll down and unspool occurred in a corpus of books? (source: Google Ngram Viewer )