a person present but not involved; chance spectator; onlooker.

1610–20; by- + stander

observer, viewer, passerby, witness; rubberneck, sidewalk superintendent. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To bystander
World English Dictionary
bystander (ˈbaɪˌstændə)
a person present but not involved; onlooker; spectator

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Word Origin & History

1610s, from by + stand -er (1).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
The intense press coverage also led to serious investigation of the bystander
  effect by psychologists and sociologists.
Yet in this case, the space agency has chosen to be a bystander.
We don't have any bystander accounts of that moment, but the mechanically
  propelled vehicle probably caused quite a scene.
On the value of her life, on the possibility of saving it, science faded into a
  mute bystander.
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature