spark plug

noun

Definition of spark plug

1 : a part that fits into the cylinder head of an internal combustion engine and carries two electrodes separated by an air gap across which the current from the ignition system discharges to form the spark for combustion

2 : one that initiates or gives impetus to an undertaking

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Examples of spark plug in a Sentence

Recent Examples on the Web The dissimilar metals in the aluminum heads and the spark plug materials make removal of the plugs difficult — which means potentially costly. — Motormouth Bob Weber, Star Tribune, "Motormouth: Changing spark plugs early isn't necessary," 18 Dec. 2020 This 51-piece kit comes with a wrench, ratchet, spark plug sockets, pliers, tire gauge, screwdriver and other items needed to fix a vehicle in an emergency situation. — Hannah Drown, cleveland, "15 essential items for winter emergencies, snowstorms to keep in your car," 1 Dec. 2020 Where Anthony could fit with the Spurs, at least initially, is as a scoring spark plug off the bench. — Jeff Mcdonald, ExpressNews.com, "Spurs draft profile: North Carolina’s Cole Anthony primed for NBA," 28 Oct. 2020 Lorenzo Cain, a spark plug in the leadoff spot, opted out of the season after one week. — Tom Haudricourt, Milwaukee Journal Sentinel, "19 games in 17 days: That's the challenge underachieving Brewers face to make the playoffs," 10 Sep. 2020 There is another spark plug inside the cylinder that then ignites fuel in the normal way. — Peter Valdes-dapena, CNN, "Maserati unveils its first supercar in 15 years," 9 Sep. 2020 If a conventional spark plug is like a lighter, Singleton’s plasma plug is more like a lightning bolt. — Daniel Oberhaus, Wired, "Is Lightning-Fast Plasma the Key to a Cleaner Car Engine?," 9 Sep. 2020 The spark plug of the Tigers — offensively, defensively and with his personality in the clubhouse — is done for the season. — Evan Petzold, Detroit Free Press, "How Detroit Tigers plan to adjust as JaCoby Jones' season ends with fractured hand," 2 Sep. 2020 Thirty years ago newspapers owned the ad market for sweaters, used cars, baseball gear, spark plugs. — Chris Erskinecolumnist, Los Angeles Times, "Chris Erskine: I’m leaving The Times. I hope you had a laugh or two in my long run here," 30 Apr. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'spark plug.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.