help oneself vs trouser

help oneself

verb
  • To take something freely; to serve oneself without restraint. 

  • Used other than figuratively or idiomatically: see help. 

  • To serve oneself, especially to take food or other supplies, rather than wait to be served by another; used to indicate friendly permission or invitation. 

  • To exhibit self-control. 

trouser

verb
  • To take and keep (something, especially money, that is not one's own); to pocket. 

  • To secretively steal (an item or money) for personal use. 

  • To put (money) into one's trouser pocket; to pocket. 

noun
  • A pair of trousers. 

  • Of or relating to trousers. 

How often have the words help oneself and trouser occurred in a corpus of books? (source: Google Ngram Viewer )