Etymology
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onlooker (n.)

"spectator, one who observes but does not participate," c. 1600, from on + agent noun from look (v.). Old English had a verb onlocian, but the modern verb onlook (1867) appears to be a back-formation from onlooker.

updated on August 26, 2019

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Definitions of onlooker from WordNet

onlooker (n.)
someone who looks on;
Synonyms: looker-on
From wordnet.princeton.edu, not affiliated with etymonline.