Definition of "Pop"

Pop¹

/pɒp/

noun
plural Pops
1. A social club and debating society at Eton College.
2. The body of college prefects.

Pop²

/pɒp/

noun
plural Pops
1. (also in plural) A popular classical music concert.
  Quotations
  As to the tall, curly-haired man, I suppose it was the one who was with me at the last Pop.
  1897, Bram Stoker, “Chapter 5”, in Dracula, New York, N.Y.: Modern Library

Pop³

/pɒp/

proper noun
1. (colloquial, US, theater) Traditional nickname for a stage doorman.
  Quotations
  “All the other stars would leave the theatre wearing fur coats, fancy hats, and imported French shoes,” said Pop Stern, a longtime stage-doorman.
  1982, Jhan Robbins, Front Page Marriage, page 186
  […] George Melford (Pop, stage doorman) […]
  1999, Amy Dunkleberger, Patricia King Hanson, AFI Catalog of Motion Pictures Produced in the United States, page 216
  […] Ralph Sanford (doorman); A.S. “Pop” Byron (stage doorman); Allen Fox (photographer); […]
  2020, Edwin M. Bradley, Hollywood Musicals You Missed, page 65