plug in WordNet English dictionary

1. blatant or sensational promotion
   ballyhoo  hoopla  hype  plug 
   
2. a wad of something chewable as tobacco
   chew  chaw  cud  quid  plug  wad 
   
3. an upright hydrant for drawing water to use in fighting a fire
   fireplug  fire hydrant  plug 
   
4. an old or over-worked horse
   hack  jade  nag  plug 
   
5. an electrical device with two or three pins that is inserted in a socket to make an electrical connection
   plug  male plug 
   
6. blockage consisting of an object designed to fill a hole tightly
   plug  stopper  stopple 
   
7. 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  plug 
   

1. persist in working hard
   "Students must plug away at this problem"
   plug  plug away 
   
2. insert as a plug
   "She plugged a cork in the wine bottle"
   plug 
   
3. insert a plug into
   "plug the wall"
   plug 
   
4. make a plug for; praise the qualities or in order to sell or promote
   plug 
   
5. deliver a quick blow to
   "he punched me in the stomach"
   punch  plug 
   
6. fill or close tightly with or as if with a plug
   "plug the hole"; "stop up the leak"
   plug  stop up  secure