ث و رth-w-r
(ن) ثَوَرَ يَثْوُرُthawara yathwuru (original form) → ثَارَ يَثُوْرُ ثَوْرًا وَثَوَرَانًاthāra yathūru thawran wa-thawarānan: to rise, to flare up, for dust to fly.
ثَوْرthawr: a bull (because it turns over the earth).
Form IV (ifʿāl) أَثَارَ يُثِيْرُ إِثَارَةًathāra yuthīru ithāratan: to raise, to stir up, to turn over the earth by ploughing. This root occurs five times in the Quran, mostly in this verb form: ﴿فَتُثِيْرُ سَحَابًا﴾ (Ar-Rūm 30:48); ﴿لَا ذَلُوْلٌ تُثِيْرُ الْأَرْضَ﴾ (Al-Baqarah 2:71); ﴿وَاَثَارُوا الْاَرْضَ﴾ (Ar-Rūm 30:9)