loiter vs step on it

loiter

verb
  • To stand about without any aim or purpose; to stand about idly. 

  • To remain at a certain place instead of moving on. 

  • For an aircraft to remain in the air near a target. 

noun
  • A standing or strolling about without any aim or purpose. 

step on it

verb
  • To act quickly. 

  • To drive fast; to step on the accelerator. 

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