1. sparkplug - Noun
2. sparkplug - Verb
sparkplug (plural sparkplugs)
Alternative form of spark plug
sparkplug (third-person singular simple present sparkplugs, present participle sparkplugging, simple past and past participle sparkplugged)
(transitive) To serve as the driving force behind (a new endeavour).
I've only read two books in my life: Baseball Sparkplug and Love Story. George Brett