debark vs level off

debark

verb
  • To disembark. 

  • To devocalize (a dog). 

  • To unload goods from an aircraft or ship. 

  • To remove the bark from a tree, especially one that has been felled. 

level off

verb
  • to get to a stable level; to cease climbing, descending, or oscillating 

How often have the words debark and level off occurred in a corpus of books? (source: Google Ngram Viewer )