bystander

The definition of a bystander is a person who stands near but doesn't take part in an event.

(noun)

Someone who happens to walk into a store while it's being robbed is an example of a bystander.

See bystander in Webster's New World College Dictionary

noun

a person who stands near but does not participate; mere onlooker

See bystander in American Heritage Dictionary 4

noun

A person who is present at an event without participating in it.

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