The present participle of 'err'; making mistakes or behaving wrongly.
From 'err', which comes from Latin 'errare' meaning 'to wander' or 'to make a mistake'. The '-ing' suffix converts the verb into a gerund or present participle.
When we 'err,' we're 'wandering' from the right path—the same root gives us 'errant' (a wandering knight) and 'erratic' (wandering off course)!
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