The word(s) "frighten" appears 4 time(s) in 4 verse(s) in Quran in Mohsin Khan translation.

(1) And verily they were about to frighten you so much as to drive you out from the land. But in that case they would not have stayed (therein) after you, except for a little while.

(سورة الإسراء, Al-Israa, Chapter #17, Verse #76)
(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 shall have coverings of Fire, above them and covering (of Fire) beneath them. With this Allah does frighten His slaves: "O My slaves, therefore fear Me!"

(سورة الزمر, Az-Zumar, Chapter #39, Verse #16)
(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)

(3) Is not Allah Sufficient for His slave? Yet they try to frighten you with those (whom they worship) besides Him! And whom Allah sends astray, for him there will be no guide.

(سورة الزمر, Az-Zumar, Chapter #39, Verse #36)
(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)

(4) As if they were (frightened) wild donkeys.

(سورة المدثر, Al-Muddathir, Chapter #74, Verse #50)
(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)