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Definition of spark plug noun from the Oxford Advanced Learner's Dictionary

spark plug

noun
 
/ˈspɑːk plʌɡ/
 
/ˈspɑːrk plʌɡ/
(also plug)
(British English also sparking plug)
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  1. a part in a car engine that produces a spark (= a flash of electricity) which makes the fuel burn and starts the engineTopics Transport by car or lorryc2
See spark plug in the Oxford Advanced American Dictionary
Check pronunciation: spark plug

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