Origin: Germanic Old English suffix
Eyewitness has 4 different meanings across 2 categories:
a spectator who can describe what happened
"The police called several eyewitnesses to testify about the events they saw unfold at the accident scene."
Someone who sees an event and can report or testify about it.
"The police interviewed every eyewitness to ensure they could accurately describe what happened during the accident."
be present at an event and see it with one's own eyes
"The police interviewed every eyewitness who was standing near the stage when the fireworks accidentally exploded."
To be present at an event, and see it
"The police interviewed every eyewitness who was present at the accident to get a clear description of what happened."