Definition of passerby noun from the Oxford Advanced American Dictionary

 

passerby

 noun
(also passer-by)noun
NAmE//ˌpæsərˈbaɪ//
 
(pl. passersby, passers-by)
 
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a person who is going past someone or something by chance, especially when something unexpected happens Police asked passersby if they had seen the accident. Thesauruswitnessobserver 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 afterwardPatterns a(n) witness/observer/onlooker/passerby/bystander/eyewitness sees something a(n) observer/onlooker/passerby/bystander witnesses something