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Entry 8 senses · 2 variants Webster, 1913

Plug

/plŭg/ · IPA /plʌɡ/
01 n. Any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.
  1. 1.
    Any piece of wood, metal, or other substance used to stop or fill a hole; a stopple.
  2. 2.
    A flat oblong cake of pressed tobacco.[U. S.]
  3. 3.
    A high, tapering silk hat.[Slang, U.S.]
  4. 4.
    A worthless horse.[Slang, U.S.]
  5. 5.
    A block of wood let into a wall, to afford a hold for nails.(Building)
  6. 6.
    An act of plugging{6}; a brief mention for the sake of publicity or advertisement, especially during a public event not specifically intended for advertising purposes; as, he put in a plug for his favorite charity.
Phrases & compounds
Breech plug — in breech-loading guns, the metal plug or cylinder which closes the aperture in the breech, through which the gun is loaded.
Fire plug — a street hydrant to which hose may be attached.
Hawse plug — a plug to stop a hawse hole.
Plug and feather — See Feather, n., 7.
Plug centerbit — a centerbit ending in a small cylinder instead of a point, so as to follow and enlarge a hole previously made, or to form a counterbore around it.
Plug rod — , a rod attached to the beam for working the valves, as in the Cornish engine.
Plug valve — a tapering valve, which turns in a case like the plug of a faucet.
02 v. t. To stop with a plug; to make tight by stopping a hole.
imp. & p. p. Plugged; p. pr. & vb. n. Plugging
  1. 1.
    To stop with a plug; to make tight by stopping a hole.
  2. 2.
    To briefly publicize or advertise, especially during a public event not specifically intended for advertising purposes; as, during the interview he plugged his new book.
Syn. put in a plug for.