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1. Blockage consisting of an object designed to fill a hole tightly
   - stopper, stopple
    
2. An electrical device with two or three pins that is inserted in a socket to make an electrical connection
   - male plug
    
3. Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark
   - spark plug, sparking plug
    
4. [informal] A recommendation or promotion of something as part of an article, talk, TV show, etc.
   "during the interview she slipped in a plug for her book"
    
5. A wad of something chewable as tobacco
   - chew, chaw, cud, quid, wad
    
6. [N. Amer, informal] An old or over-worked horse
   - hack, jade, nag
    
7. [N. Amer, informal] An upright hydrant for drawing water to use in fighting a fire
   - fireplug [N. Amer], fire hydrant
    
8. (fishing) a type of lure consisting of a rigid, buoyant or semi-buoyant body and one or more hooks

1. Fill or close tightly with or as if with a plug
   "plug the hole";
   - stop up, secure
    
2. [informal] Persist in working hard
   "Students must plug away at this problem";
   - plug away
    
3. [N. Amer, informal] Deliver a quick blow to
   "he plugged me in the stomach";
   - punch, dong [Austral, NZ, informal]
    
4. Advertise; praise the qualities of something in order to sell or promote
    
5. Insert a plug into
   "plug the wall"
    
6. Insert as a plug
   "She plugged a cork in the wine bottle"
    
7. Replace the centre of a coin with a baser metal
   "plug a nickle"

Derived forms: plugs, plugged, plugging

See also: plugged

Type of: advertise, advertize [US, non-standard], bit, bite, block, blockage, close, closure, electrical device, enclose, Equus caballus, fill up, flack [N. Amer, informal], hang in, hang on, hit, hold on, horse, hydrant, inclose, insert, introduce, morsel, occlusion, persevere, persist, promote, push, put in, stick in, stop, stoppage

Part of: ignition, ignition system

Encyclopedia: Plug