onlooker
Americannoun
noun
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Etymology
Origin of onlooker
Explanation
An onlooker is someone who watches something but isn't directly involved in it. The spectators at a boxing match or a dog show or a marathon are all onlookers. If you observe an event but you don't participate in it, you're an onlooker. The event itself might be a performance of some kind, like a concert or a football match, or it might be some undesirable occurrence: "The firefighters battled the blaze while onlookers watched in horror." Onlooker dates from the early seventeenth century, from the sense of "looking on."
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.