mothball vs suspend proceedings

mothball

verb
  • To store or shelve something no longer used. 

  • To stop using (something), but keep it in good condition. 

noun
  • A small ball of chemical pesticide (typically naphthalene) and deodorant placed in or around clothing and other articles susceptible to damage from mold or moth larvae in order to protect them from this damage. 

suspend proceedings

How often have the words mothball and suspend proceedings occurred in a corpus of books? (source: Google Ngram Viewer )