Webster's English Dictionary

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plug

1. plug \'pl*g\ n [D, fr. MD plugge; akin to MHG pfloc plug] 1: a piece 
   used to fill a hole : STOPPER  2: a flat compressed cake of tobacco  3: 
   SHOT  4: a small core or segment removed from a larger object  5: something 
   inferior; esp : an inferior often aged or unsound hors e; also : a quiet 
   steady cold-blooded horse usu. of light or moderate weight 6a: FIREPLUG  
   6b: SPARK PLUG  7: an artificial angling lure used primarily for casting 
   and made with one  or more sets of gang hooks 8: any of various devices 
   resembling or functioning like a plug : as  8a: a male fitting for making 
   an electrical connection by insertion in a re ceptacle or body of 
   electrical equipment to a circuit 8b: a device for connecting electric 
   wires to a jack  9: a piece of favorable publicity usu. incorporated in 
   general matter 
2. plug vb or plugged;  or plug.ging 1: to stop, make tight, or secure by 
   inserting a plug  2: to hit with a bullet : SHOOT  3: to advertise or 
   publicize insistently  1: to become plugged - usu. used with up  2: to work 
   doggedly and persistently  3: to fire shots  - plug.ger n