spark plugnoun [ C ]uk /ˈspɑːk ˌplʌɡ/ us /ˈspɑːrk ˌplʌɡ/
spark plug noun [ C ] (ENGINE)
spark plug noun [ C ] (PERSON)
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(Definition of “spark plug” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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water, especially from a river or stream, dropping from a higher to a lower point, sometimes from a great height