Someone or something that spills, or a device designed to cause spillage or reduce flow.
From Old English 'spillan' (to destroy, spill), possibly from Proto-Germanic *spiloan. The agent noun 'spiller' (one who spills) follows standard English word-formation patterns.
In racing and aerodynamics, a 'spoiler' isn't a typo for 'spiller'—though they're related concepts! A spoiler disrupts air flow, while a spiller actively releases liquid. Engineers borrowed the dramatic word 'spoiler' to sound more important than 'the thing that disrupts air.'
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