Plug

1. Blockage consisting of an object designed to fill a hole tightly. A peg plugged the water leaking in the bottom of the boat.
2. A wad of something chewable such as tobacco. He put a plug of tobacco in his cheek.
3. Electrical device that fits into a gas engine that ignites the gas (spark plug). Spark plug have to be changed from time to time.
4. An electrical device with two or three pins that is inserted in a socket to make an electrical connection. Plug in the TV set and you are ready to use it.
5. An fire hydrant for drawing water to use in fighting a fire (fire plug). If you park next to a fire plug you will get a ticket.