A person or group that makes sudden attacks or raids to steal or capture something.
From 'raid' (from Scottish 'raid' meaning a journey or road expedition), which became 'redd' in Middle English. A raider is one who goes on such raids, originally used for Viking and frontier attackers.
Viking raiders were so legendary that the word 'raid' itself comes from their activities, but they were actually sophisticated traders too—they mapped trade routes to the Mediterranean and beyond, not just warriors.
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