girlfriend vs petticoat

girlfriend

noun
  • A female friend. 

  • A female partner in an unmarried romantic relationship. 

  • A fellow gay man, especially a friend as opposed to a sexual partner. 

  • A term of address for a female friend or among gay men. 

petticoat

noun
  • A woman. 

  • A light woman's undergarment worn under a dress or skirt, and hanging either from the shoulders or (now especially) from the waist; a kind of slip, worn to make the skirt fuller, or for extra warmth. 

  • A woman's undercoat, worn to be displayed beneath an open gown. 

  • A fisherman's loose canvas or oilcloth skirt. 

  • A bell-mouthed piece over the exhaust nozzles in the smokebox of a locomotive, strengthening and equalising the draught through the boiler-tubes. 

  • A type of ornamental skirt or underskirt, often displayed below a dress; chiefly in plural, designating a woman's skirts collectively. 

  • A tight, usually padded undercoat worn by men over a shirt and under the doublet. 

verb
  • To dress in a petticoat. 

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