maintain vs wait on

maintain

verb
  • To keep up; to preserve; to uphold (a state, condition etc.). 

  • To declare or affirm (a clause) to be true; to assert. 

wait on

verb
  • To wait for (a thing, or an event to take place). 

  • To provide a service to (someone); to act as a servant to (someone); to serve (someone) as a waiter or waitress in a restaurant. 

  • To wait for (a person). 

  • To fly above its master, waiting till game is sprung. 

  • To be in store for (someone). 

How often have the words maintain and wait on occurred in a corpus of books? (source: Google Ngram Viewer )