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plug in to connect (an appliance) to a power source.
plug up to block the flow of a liquid or gas through (something). [2 definitions]
plug-compatible of or designating computer equipment that can be linked with that of another manufacturer without electrical adapters.
plug-in a supplementary software application that adds enhanced functionality to a computer program. [2 definitions]
plug-in electric vehicle any motor vehicle powered by battery packs that can be recharged using an external source of electricity.
spark plug a device threaded into the cylinder of an internal-combustion engine that produces sparks that ignite fuel. [2 definitions]