en_tn/pro/06/34.md

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furious

very angry

he will show no mercy

The "he" is the neighbor whose wife has committed adultery with another man. Alternate translation: "he will not limit the pain he will cause you" or "he will hurt you as much as he can" (See: rc://en/ta/man/jit/figs-litotes)

on the day of vengeance

"when he takes revenge"