What does plug mean?
A plug is a small object that fits into, closes, or connects with an opening. The most familiar use is an electrical plug, which connects an appliance to a socket, although plugs can also stop leaks, seal pipes, or fill holes. As a verb, “plug” describes inserting a stopper or connector, but it can also mean to block a passage or prevent progress. In informal English, to plug something means to recommend it enthusiastically, especially online or in conversation. These related meanings share an idea of making a connection, filling a gap, or stopping something from getting through. The word is common in both British and American English and appears in everyday household, technical, and conversational contexts.
A small device, stopper, or connector that fits into an opening or socket.
"She pulled the plug from the wall to disconnect the computer."
In electrical contexts, a plug is the part on the end of a cable that fits into a socket or outlet.
An informal, enthusiastic recommendation or advertisement for a product, service, or other offering.
"The video is essentially a plug for the restaurant."
This sense is informal and is especially common in spoken English and online discussion.
To insert a plug or stopper into an opening, or to connect a device to a power source.
"He plugged the phone in to charge it overnight."
In British English, the related form “plug in” is especially common for connecting an appliance to an electrical outlet.
To block, fill, or obstruct an opening, passage, or area.
"They used sandbags to plug the gap in the fence."
This sense can describe both physically filling an opening and more figuratively preventing movement or progress.
The standard plural of the noun is “plugs,” used for multiple electrical connectors, stoppers, or informal recommendations.
"The technician tested several plugs before replacing the faulty one."
From filling a leaky hole to connecting a device to power, “plug” describes the useful little object that closes or links up a gap.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does plug come from?
The word comes through English from Dutch plugge, a word related to plugging or filling an opening. Its development reflects the long-standing use of plugs and stoppers to close holes, pipes, and sockets. The electrical sense developed from the general sense of a fitting or stopper, while the informal promotional sense is a later figurative extension associated with inserting or putting forward a product or recommendation.
Related word forms
How plug is actually used
The informal sense of recommending or promoting something is common in spoken English and online conversation. As a verb, “plug” can also mean to obstruct progress, as in “They tried to plug the gap in staffing.”
Easily confused with plug
A plug is the physical connector or stopper itself, whereas a plug-in is an appliance or device designed to be connected to an electrical outlet.
Plug is pronounced with a final /g/, while plough is pronounced with a final /f/ and refers to a farming implement.