bystander
/ˈbaɪˌstænd.ə(ɹ)/ noun C1- A person who, although present at some event, does not take part in it; an observer, witness, or spectator.
Plural bystanders
From the library
Having broken her wings by the blow, she fell to the ground, and was caught by one of the bystanders.
One of the bystanders interrupted him, saying: “Now, my good man, if this be all true there is no need of witnesses.
A bystander said to him, “Be satisfied with half the quantity, and you will readily draw out your hand.”
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