busy vs rushed off one's feet

busy

adj
  • Crowded with business or activities; having a great deal going on. 

  • Having a lot going on; complicated or intricate. 

  • Officious; meddling. 

  • Engaged in activity or by someone else. 

noun
  • A police officer. 

verb
  • To rush somebody. 

  • To make somebody busy or active; to occupy. 

rushed off one's feet

adj
  • Extremely busy. 

How often have the words busy and rushed off one's feet occurred in a corpus of books? (source: Google Ngram Viewer )