annex vs leave off

annex

noun
  • An appendix to a book or document. 

  • An addition to the territory of a country or state, from a neighbouring country or state, normally by military force. 

  • An addition, an extension. 

  • An addition or extension to a building. 

verb
  • To attach or connect, as a consequence, condition, etc. 

  • To join; to be united. 

  • To add something to another thing, especially territory; to incorporate. 

leave off

verb
  • To omit. 

  • To desist; to cease. 

  • To stop with a view to resuming at a later point. 

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