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English definition of “have-a-go hero”

have-a-go hero

noun [C]     /ˌhæv.ə.ɡəʊ ˈhɪə.rəʊ/ US  /-ɡoʊˈhɪr.oʊ/ UK informal
an ordinary person who does something brave in order to try and stop a crime
(Definition of have-a-go hero noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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