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WordReference Random House Learner's Dictionary of American English © 2024ˈspark ˌplug, n. [countable]- Automotivea device that sets on fire the fuel mixture in a cylinder of an engine.
- Informal Termsa person who leads, inspires, or enlivens others.
WordReference Random House Unabridged Dictionary of American English © 2024spark′ plug′, - Automotivea device designed to fit in each cylinder of a gasoline-powered internal-combustion engine and to produce the electric spark for igniting the mixture of gasoline and air.
- Informal Termsa person who leads, inspires, or animates a group.
spark•plug (spärk′plug′),USA pronunciation v.t., -plugged, -plug•ging. [Informal.]- Informal Termsto lead, inspire, or animate something or someone.
- verb, verbal use of spark plug
Collins Concise English Dictionary © HarperCollins Publishers:: spark plug n - another name for sparking plug
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