Definition of "plug"

plug

/plʌɡ/

noun
plural plugs
1. (electricity) A pronged connecting device which fits into a mating socket, especially an electrical one.
  1. (loosely) An electric socket: wall plug.
2. Any piece of wood, metal, or other substance used to stop or fill a hole.
3. (US) A flat oblong cake of pressed tobacco.
4. (US, slang) A high, tapering silk hat.
5. (US, slang) A worthless horse.
6. (dated) Any worn-out or useless article.
7. (dated, slang) A book that fails to sell.
  Quotations
  Stack all new and fresh, composed of the fast-selling standard books only — no old plugs or unsalable books whatever.
  1886, The Publishers Weekly, volume 29, page 25
  Many New York booksellers promoted the impression that Quaritch had sent only 'plugs' (i.e. unsaleable books).
  1997, The Book Collector, volume 46, page 184
8. (construction) A block of wood let into a wall to afford a hold for nails.
9. (slang) A promotion (act of promoting) a product (such as a book, film or play) or other thing (concept, etc), for example during an interview or a commercial.
10. (geology) A body of once molten rock that hardened in a volcanic vent. Usually round or oval in shape.
11. (fishing) A type of lure consisting of a rigid, buoyant or semi-buoyant body and one or more hooks.
12. (horticulture) A small seedling grown in a tray from expanded polystyrene or polythene filled usually with a peat or compost substrate.
13. (jewelry) A short cylindrical piece of jewellery commonly worn in larger-gauge body piercings, especially in the ear.
14. (slang) A drug dealer.
  Quotations
  He saw me catch a trap and leave the house of a drug dealer. That's why he targeted me. He could have easily blown my ass off right then and there for lying, but for some reason he didn't. He just left. I biked back to my plug's spot and told him […]
  2017, Gucci Mane, Neil Martinez-Belkin, The Autobiography of Gucci Mane, page 32
15. A branch from a water-pipe to supply a hose.
16. (aviation) A standard, modular fuselage component that can be added or removed.
  Quotations
  Add front and aft closures to the fuselage midsection. Addition or subtraction of fuselage plugs, to a maximum of five rows, conveniently distributed on each side of wing, is possible.
  2010, Ajoy Kumar Kundu, Aircraft Design, page 165
verb
third-person singular simple present plugs, present participle plugging, simple past and past participle plugged
1. (transitive) To stop with a plug; to make tight by stopping a hole.
2. (transitive) To blatantly mention a particular product or service as if advertising it.
  Quotations
  He [Mike Skinner] treats the gig as an opportunity repeatedly to plug the after-party, where he will be DJing.
  2019 January 26, Kitty Empire [pseudonym], “The Streets review – the agony and ecstasy of a great everyman”, in Katharine Viner, editor, The Guardian‎, London: Guardian News & Media, archived from the original on 8 April 2019
3. (intransitive, informal) To persist or continue with something.
4. (transitive) To shoot a bullet into something with a gun.
  Quotations
  I am awfully glad that you kept your nerve and plugged him; it would have been better if you could have nailed him through the right shoulder, which would not have killed him...
  1884, H. Rider Haggard, The Witch's Head
5. (slang, transitive) To have sex with, penetrate sexually.
6. (slang, transitive) To ingest a drug rectally