Etymology
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comeuppance (n.)

also comeupance, "one's deserts, reversal or punishment that one deserves," 1859, presumably it is rooted in the same notion in the verbal phrase come up "present oneself for judgment before a tribunal" (see come + up (adv.)) + -ance.

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Definitions of comeuppance

comeuppance (n.)
an outcome (good or bad) that is well deserved and fitting;
Synonyms: just deserts / comeupance / poetic jstice
From wordnet.princeton.edu