spark plug
Noun

spark plug (plural spark plugs)

  1. The part of an internal combustion engine which forms a high-voltage electric spark which ignites the fuel-air mixture to begin the power stroke.
  2. (figuratively) Someone who is a driving force in new endeavours.
    Synonyms: straw that stirs the drink, catalyst, instigator, mover and shaker, stimulus
Translations


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