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 More importantly, Navarro is a spark plug behind the scenes. — Jack Harris, Los Angeles Times, 24 Aug. 2021 The message from La Russa was the physically fit, 28-year-old spark plug of the Sox lineup wasn’t injured but had sore legs. — Paul Sullivan, chicagotribune.com, 24 Aug. 2021 And Chelsey Perry, who was released to make space for Hatar at the beginning of the season, has embraced her role as a spark plug off the bench. — J.l. Kirven, The Indianapolis Star, 6 Aug. 2021 In return, the Dodgers added an ace starter who will probably follow Walker Buehler in the rotation and a spark plug who will energize the top of the order. — Bill Plaschke, Los Angeles Times, 30 July 2021 D'Alie is Italy's spark plug, court general and unofficial spokeswoman — in two languages. — Ken Maguire, Star Tribune, 22 July 2021 To drive this car, the driver needed to explicitly control the air/fuel mixture and the point where the spark plug met the ignition. — Nisha Talagala, Forbes, 21 June 2021 Try calling her Softball America freshman of the year, UCLA’s power-hitting left-hander or a do-it-all defensive spark plug. — Houston Mitchell Assistant Sports Editor, Los Angeles Times, 29 Apr. 2021 Nobody at the spark plug factory can get a raise if sales are declining. — Frank Lavin, Forbes, 10 Mar. 2021

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.