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filler cap

noun
🔊/ˈfɪlə kæp/
🔊/ˈfɪlər kæp/
(British English also petrol cap)
(North American English also gas cap)
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  1. a cover for the end of the pipe through which fuel is put into a vehicle（汽车）加油口盖，油箱盖，管盖Topics Transport by car or lorryc2