Definition of plug

The word "plug" has an interesting history. The term "plug" originally referred to a block of wood or metal used to stop a hole, such as a leak in a ship's hull. This usage dates back to the 15th century. From there, the meaning of "plug" expanded to include a variety of other objects that served as a stopper or seal, such as a cork or a bung. In the late 19th century, the term "plug" began to be used in the context of electricity, referring to a device used to connect and disconnect electrical circuits. The modern electrical plug, with its prongs and outlets, emerged in the early 20th century. Throughout its evolution, the core meaning of "plug" has remained the same: a device used to block, stop, or connect something. Whether it's a leak in a ship or an electrical circuit, the word "plug" has become an essential part of our vocabulary.