ث ر بth-r-b
(ض) ثَرَبَ يَثْرِبُ ثَرْبًاtharaba yathribu tharban: to regard someone's deed as bad.
Form II (tafʿīl) ثَرَّبَ يُثَرِّبُ تَثْرِيْبًاtharraba yutharribu tathrīban: to reproach someone for his deed, to rebuke. ﴿لَا تَثْرِيْبَ عَلَيْكُمُ الْيَوْمَ﴾ (Yūsuf 12:92)
يَثْرِبُyathribu: the old name of Madinah. ﴿يٰٓاَهْلَ يَثْرِبَ لَا مُقَامَ لَكُمْ﴾ (Al-Aḥzāb 33:13)