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English definition of “bystander”

bystander

noun [C] uk   /ˈbaɪˌstæn.dər/ us    /-dɚ/
a person who is standing near and watching something that is happening but is not taking part in it: Many innocent bystanders were injured by the explosion.
(Definition of bystander from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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