the.com/payback

Revenge that files paperwork and calls itself justice.

means The repayment of a debt, loan, or investment — or, more often, the act of getting even with someone for a wrong they did you.

from A straightforward 19th-century compound of 'pay' plus 'back' — paying something back. It started in plain financial sense (loan payback periods, investment returns) and by the mid-20th century had curdled into slang for retaliation, where the 'debt' being repaid is an insult or injury rather than a dollar amount.

origin
financial term before it meant vengeance
economics twist
payback period just means investment recoup time
psychology
feels sweeter in anticipation than in execution
irony
rarely ends the cycle it claims to close
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