plug definition

1. blockage consisting of an object designed to fill a hole tightly
2. an electrical device with two or three pins that is inserted in a socket to make an electrical connection
3. fill or close tightly with or as if with a plug
• examples: plug the hole
• examples: stop up the leak
4. persist in working hard
• examples: Students must plug away at this problem
5. make a plug for; praise the qualities or in order to sell or promote
6. insert a plug into
• examples: plug the wall
7. insert as a plug
• examples: She plugged a cork in the wine bottle