To cause severe damage, harm, or destruction, usually used with 'havoc' or 'vengeance' (as in 'wreak havoc').
From Old English 'wrecan' (to drive, hunt, or punish). Originally meant to drive someone into exile or cause punishment, but evolved to mean general destruction and harm.
The word 'wreak' and 'wreck' both come from the same Old English root meaning 'to drive,' but they split apart centuries ago—'wreak' describes causing damage (abstract) while 'wreck' is the result (concrete damage), yet people still confuse them constantly.
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