[plug] n [D, fr. MD plugge; akin to MHG pfloc plug] (1627) 1 a: a piece used to fill a hole: stopper b: an obtruding or obstructing mass of material resembling a stopper
2: a flat compressed cake of tobacco
3: a small core or segment removed from a larger object
4: something inferior; esp: an inferior often aged or unsound horse; also: a quiet steady cold-blooded horse usu. of light or moderate weight
5. a: hydrant, fireplug b: spark plug
6: an artificial angling lure used primarily for casting and made with one or more sets of gang hooks 7: any of various devices resembling or functioning like a plug: as a: a male fitting for making an electrical connection to a live circuit by insertion in a receptacle (as an outlet) b: a device for connecting electric wires to a jack 8: a piece of favorable publicity or a favorable mention usu. incorporated in general matter
[2]plug vb plugged ; plug.ging vt (1630) 1: to stop, make tight, or secure by inserting a plug
2: to hit with a bullet: shoot
3: to advertise or publicize insistently ~ vi 1: to become plugged--usu. used with up
2: to work doggedly and persistently "plugged away at her homework"
3: to fire shots -- plug.ger n -- plug into : to connect or become connected to by or as if by means of a plug "the city was plugged into the new highway system"