Definition of "passerby" [pas•ser•by]

• A person who passes by, especially casually or by chance. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Again, a passerby is the one who saw something, pulled over, saw the bodies, or at least one body at that hour, called the authorities."
• "In the first nine issues we've already had Batman ask Robin if he was retarded, The Joker strangling a woman he's just had sex with, Wonder Woman calling a passerby a "sperm bank," Batman and Black Canary having illicit sex on a filthy dock after just meeting."
• "The gangs of feral youths that "own" the streets now know that the chances of a policeman catching them in the act of mugging a passerby are almost zero, the chances of any CCTV actually working or producing a decent image or not being used to take photos of cars parked six inches onto a yellow line or one minute into a proscribed period are also nil and even if caught the chances of being charged let alone convicted are somewhat slim and as for having to go to prison for more than six months, the odds are infinitesimal."