Bystander
/bˈaɪˌstændər/
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Definition
(noun) A person who, although present at some event, does not take part in it; an observer, witness, or spectator.
Sentence Examples
A bystander videotaped the police beating using their cell phone.
I'm just an innocent bystander.
CEFR Practice Quiz
An innocent ____ was injured during the sudden fight in the street.