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Etymology tree Proto-Italic *wre- Latin re- Proto-Indo-European *sek- Proto-Indo-European *-yeti Proto-Indo-European *sékh₁yeti Proto-Italic *sekaō Latin seco Latin resecōdeverb. Vulgar Latin *resecum Old Italian riscobor. ▲ Old Italian risco Italian rischio Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-yéti Proto-Indo-European *-eh₂yéti Proto-Indo-European *-h₂tiinflu. Proto-Italic *-ājō Proto-Italic *-āō Latin -ō Italian -are Italian rischiarebor. Middle French risquebor. English risque English risk From earlier risque, from Middle French risque, from Old Italian risco (“risk”) (modern Italian rischio) and rischiare (“to run into danger”). Displaced native Old English pleoh (“risk”) and plēon (“to risk”). Speculation on earlier roots Most dictionaries consider the etymology of these Italian terms uncertain, but some suggest they perhaps come from Vulgar Latin *resecum (“that which cuts, rock, crag”) (> Medieval Latin resicu), from Latin resecō (“cut off, loose, curtail”, verb), in the sense of that which is a danger to boating or shipping; or from Ancient Greek ῥιζικόν (rhizikón, “root, radical, hazard”). A few dictionaries express more certainty. Collins says the Italian risco comes from Ancient Greek ῥίζα (rhíza, “cliff”) due to the hazards of sailing along rocky coasts. The American Heritage says it probably comes from Medieval Greek ῥιζικό, ριζικό (rhizikó, rizikó, “sustenance obtained by a soldier through his own initiative, fortune”), from Arabic رِزْق (rizq, “sustenance, that which God allots”), from Classical Syriac ܪܘܙܝܩܐ ,ܪܙܩܐ (rezqā, rōzīqā, “daily ration”), from Middle Persian [script needed] (rōzīg) (whence Classical Persian روزِی (rōzī)), from Middle Persian [script needed] (rōz, “day”) (whence Classical Persian روز (rōz)), from Old Persian 𐎼𐎢𐎨𐏃 (raučah) (cognate with Sanskrit रोचस् (rocas, “light, lustre”)), from Proto-Iranian *ráwčah, from Proto-Indo-Iranian *ráwčas, ultimately from Proto-Indo-European *léwk-os, from *lewk- (“bright; to shine”) + *-os (noun suffix). Karla Mallette derives the word from Arabic رِزْق (rizq, “sustenance, that which God allots”) via Sabir. Cognate with Spanish riesgo, Portuguese risco