Definition of spark plug in English:

spark plug

Syllabification: spark plug

noun

A device for firing the explosive mixture in an internal combustion engine.
More example sentences
  • Then, without the spark plug in place, pull the starter cord slowly, distributing the oil through the cylinder.
  • Sedlack first tried to disable a snowmobile by pulling out a spark plug.
  • He looked over at the battery and saw that the cap on a spark plug was loose.

Definition of spark plug in:

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Word of the day dinkum
Pronunciation: ˈdiNGkəm
adjective
(of an article or person) genuine