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Definition of passerby noun from the Oxford Advanced American Dictionary

passerby

noun (also passer-by)
/ˌpæsərˈbaɪ/ passer-by pronunciation American
plural passersby, passers-by
 
a person who is going past someone or something by chance, especially when something unexpected happensPolice asked passersby if they had seen the accident.
Usage notesThesaurus: witnessobserver onlooker passerby bystander eyewitnessThese are all words for a person who sees something happen.witness a person who sees something happen and is able to describe it to other people; a person who gives evidence in a court of law: Police are seeking witnesses to the accident.observer a person who watches something happen: According to observers, the election was peaceful and fair.onlooker a person who watches something that is happening but is not involved in it: A crowd of onlookers gathered at the scene of the accident.passerby a person who is going past someone or something by chance, especially when something unexpected happens: Police asked passersby if they had witnessed the robbery.bystander a person who is near and can see what is happening when something such as an accident or a fight takes place: Three innocent bystanders were killed in the crossfire.eyewitness a person who has seen a crime or an accident and can describe it afterwardpatternsa(n) witness/observer/onlooker/passerby/bystander/eyewitness sees somethinga(n) observer/onlooker/passerby/bystander witnesses something