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eyewitness
Sir, this woman was an eyewitness to one of the attacks.
We've got an eyewitness who saw him stab her.
I have an eyewitness who will come to testify.
According to the eyewitness, it was John who caused the accident.
I am an eyewitness of your crime.
Unfortunately, there were no eyewitnesses.
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bystander
,
onlooker
,
stander-by
[COUNTABLE]