People who watch an event or situation without participating in it; spectators or observers.
Compound word from 'on' plus 'look' plus the agent suffix '-er' and plural 's'. The term emerged in English around the 16th century, literally meaning 'those who look on'.
There's something uniquely human about being an onlooker - we're perhaps the only species that regularly gathers just to watch events unfold without participating. The word captures a fundamental aspect of human society: our tendency to form audiences, create spectacles, and find meaning in observation itself.
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