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Definition of onlooker noun from the Oxford Advanced Learner's Dictionary

onlooker

noun
 
/ˈɒnlʊkə(r)/
 
/ˈɑːnlʊkər/
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  1. a person who watches something that is happening but is not involved in it synonym bystander
    • A crowd of onlookers gathered at the scene of the crash.
    Synonyms witnesswitnessobserver onlooker passer-by 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 have appealed for witnesses to the accident.
    observer a person who sees something happen:
    • According to observers, the plane exploded shortly after take-off.
    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 crash.
    passer-by a person who is going past somebody/​something by chance, especially when something unexpected happens:
    • Police asked passers-by if they had witnessed the accident.
    bystander a person who is near and can see what is happening when something such as an accident or fight takes place:
    • Three innocent bystanders were killed in the crossfire.
    eyewitness a person who has seen a crime or accident and can describe it afterwards.
    Patterns
    • a witness/​an observer/​an onlooker/​a passer-by/​a bystander/​an eyewitness sees something
    • an observer/​an onlooker/​a passer-by/​a bystander witnesses something
See onlooker in the Oxford Advanced American Dictionary
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