acid vs headlight

acid

noun
  • LSD, lysergic acid diethylamide. 

  • A sour substance. 

  • Any compound which yields H+ ions (protons) when dissolved in water; an Arrhenius acid. 

  • Any compound that easily donates protons to a base; a Brønsted acid. 

  • Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid. 

  • Any corrosive substance. 

adj
  • Sour, sharp, or biting to the taste; tart; having the taste of vinegar. 

  • Sour-tempered. 

  • Of or pertaining to an acid; acidic. 

  • Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock. 

headlight

noun
  • Lysergic acid diethylamide (LSD). 

  • A woman's breast. 

  • A jewel; especially a diamond. 

  • A bright light, with a lens and reflector, on the front of a motor vehicle (or originally a ship or train), designed to illuminate the road when driving at night; normally one of a pair. 

  • A woman's erect nipples, partially masked by clothing. 

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