flagpole vs plug away

flagpole

verb
  • Exit a country momentarily and reenter. Usually this is done to satisfy immigration requirements. 

noun
  • A tall pole up which one or more flags may be raised and flown. 

plug away

verb
  • To persist or continue, as with an effort. 

How often have the words flagpole and plug away occurred in a corpus of books? (source: Google Ngram Viewer )