Englishfor English speakers
onset
Noun
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The onset of something is the time when it begins (usually something bad).
vortex
Noun
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A vortex is a whirlwind, whirlpool, or something else that moves in a spiral or column.
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A vortex is anything with on-going violent or chaotic activity around a center point.
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A vortex is anything which brings nearby things into its current.