plug

plug (http://definr.com/plug)

     n 1: blockage consisting of an object designed to fill a hole
          tightly [syn: stopper, stopple]
     2: a wad of something chewable as tobacco [syn: chew, chaw,
         cud, quid, wad]
     3: blatant or sensational promotion [syn: ballyhoo, hoopla,
         hype]
     4: electrical device that fits into the cylinder head of an
        internal-combustion engine and ignites the gas by means of
        an electric spark [syn: spark plug, sparking plug]
     5: an electrical device with two or three pins that is inserted
        in a socket to make an electrical connection [syn: {male
        plug}]
     6: an upright hydrant for drawing water to use in fighting a
        fire [syn: fireplug, fire hydrant]
     7: an old or over-worked horse [syn: hack, jade, nag]
     v 1: fill or close tightly with or as if with a plug; "plug the
          hole"; "stop up the leak" [syn: stop up, secure]
     2: persist in working hard; "Students must plug away at this
        problem" [syn: plug away]
     3: deliver a punch to [syn: punch]
     4: make a plug for; praise the qualities or in order to sell or
        promote