ر ج فr-j-f
(ن) رَجَفَ يَرْجُفُ رَجْفًاrajafa yarjufu rajfan: to be violently agitated, to quake, to tremble. ﴿يَوْمَ تَرْجُفُ الْاَرْضُ وَالْجِبَالُ﴾ (Al-Muzzammil 73:14)
رَجْفَةٌrajfah: an earthquake. ﴿فَاَخَذَتْهُمُ الرَّجْفَةُ﴾ (Al-Aʿrāf 7:78)
رَاجِفَةٌrājifah: the quaking one (a metaphor for the first blast of the Trumpet on the Day of Judgement). ﴿يَوْمَ تَرْجُفُ الرَّاجِفَةُ﴾ (An-Nāziʿāt 79:6)
Form IV (ifʿāl) اَرْجَفَ يُرْجِفُ اِرْجَافًاarjafa yurjifu irjāfan: to stir up unrest among people by spreading rumours.
مُرْجِفٌmurjif (active participle, ism fāʿil): a rumour-monger. ﴿وَالْمُرْجِفُوْنَ فِي الْمَدِيْنَةِ﴾ (Al-Aḥzāb 33:60)