The word(s) "threatenest" appears 2 time(s) in 2 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) They said: "Comest thou to us, that we may worship Allah alone, and give up the cult of our fathers? bring us what thou threatenest us with, if so be that thou tellest the truth!"

(سورة الأعراف, Al-A'raaf, Chapter #7, Verse #70)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)

(2) They said: "O Noah! thou hast disputed with us, and (much) hast thou prolonged the dispute with us: now bring upon us what thou threatenest us with, if thou speakest the truth!?"

(سورة هود, Hud, Chapter #11, Verse #32)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)