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English definition of “greaser”

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greaser

noun [C] uk   /ˈɡriː.sər/ us    /-sɚ/ old-fashioned slang
a man with long hair who rides a motorcycle, wears black leather clothes, and is often a member of a gang: Greasers were originally so-called because of the grease that they used on their hair and on their bikes.
(Definition of greaser from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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