1. (noun)plug, stopper, stopple blockage consisting of an object designed to fill a hole tightly
2. (noun)chew, chaw, cud, quid, plug, wad a wad of something chewable as tobacco
3. (noun)ballyhoo, hoopla, hype, plug blatant or sensational promotion
4. (noun)spark plug, sparking plug, plug electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electricspark
5. (noun)plug, male plug an electrical device with two or three pins that is inserted in a socket to make an electrical connection