Temporarily replacing someone in their job or role; or the act of doing this substitution.
From 'sub' (short for substitute), which comes from Latin 'substituere' (to put in place of). The '-ing' suffix converts it to a gerund form.
During the COVID-19 pandemic, substitute teachers became essential frontline workers, but many countries discovered their school systems had been severely underfunding subs, leading to major educational disruptions and renewed debates about teacher pay!
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