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English definition of “passer-by”

passer-by

noun [C]     /ˌpɑː.səˈbaɪ/ US  /ˌpæs.ɚ-/ (plural passers-by)
someone who is going past a particular place, especially when something unusual happens: The gunmen opened fire, killing a policeman and a passer-by.Using the eyesEyesight, glasses and lensesThe eye and surrounding areaPerceptive
(Definition of passer-by noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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