A person or thing that eggs on or encourages someone; an instigator or agitator.
From the verb 'egg on' (to incite or urge) + '-er' suffix, creating a noun for someone who actively encourages or provokes others into action.
The phrase 'egg on' likely comes from Old Norse 'eggja' meaning to drive or urge, and an 'eggler' is someone who makes their living—literally or figuratively—by stirring up trouble or excitement.
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