A person who urges or encourages someone else to do something, especially something wrong or dangerous.
From Latin 'instigare' meaning 'to urge on,' from 'in-' (toward) and 'stigare' (to prick or goad). The person who gets others to do bad things.
In many legal systems, an instigator can be tried as harshly as the person who actually committed the crime—the law recognizes that influence and ideas can be as powerful as actions!
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