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English definition of “biker”

biker

noun [C] /ˈbaɪ.kər/ US  /-kɚ/
a member of a group of people riding motorcycles: We were overtaken by a crowd of bikers doing over 90 mph.DriversMotorbikes someone who rides a bicycle, especially a mountain bikeBicycles
(Definition of biker noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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