spark plug
A 'spark plug' is crucial in engines for ignition and metaphorically represents someone who energizes a group or project.
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Definition
B2Automotive
(technical)A device in an internal combustion engine that creates a spark to ignite the fuel-air mixture.
Example
- The mechanic replaced the old spark plug to ensure the engine runs smoothly.
B2Figurative
(informal)A person who initiates or drives a project or activity.
Example
- She was the spark plug behind the successful fundraising campaign.
Similar
Terms that have similar or relatively close meanings to "spark plug":
spark gapspark coilspark testspark testingplug infuse plugbutt plug