hallucinating vs tripping

hallucinating

tripping

adj
  • Quick; nimble; stepping lightly and quickly. 

  • Having the right forefoot lifted, the others remaining on the ground, as if trotting; trippant. 

  • Saying crazy things. 

  • Undergoing a hallucinogenic trip. 

noun
  • The act of one who trips. 

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