(ن) رَقَبَ يَرْقُبُ رُقُوْبًاraqaba yarqubu ruqūban: to keep watch, to wait, to have regard for something. ﴿لَا يَرْقُبُوْنَ فِيْ مُؤْمِنٍ اِلًّا وَّلَا ذِمَّةً﴾ (At-Tawbah 9:10)
رَقِيْبٌraqīb (qualificative adjective, ṣifah mushabbahah, on the pattern of فَعِيْلٌfaʿīl): one who keeps watch, watcher, guardian. ﴿اِنَّ اللّٰهَ كَانَ عَلَيْكُمْ رَقِيْبًا﴾ (An-Nisāʾ 4:1)
رَقَبَةٌraqabah pl. رِقَابٌriqāb (noun, ism dhāt): neck (which is turned in order to keep watch); تَحْرِيْرُ رَقَبَةٍtaḥrīru raqabah is the Arabic idiom for freeing a slave. ﴿فَكُّ رَقَبَةٍ﴾ (Al-Balad 90:13); ﴿وَفِي الرِّقَابِ﴾ (At-Tawbah 9:60)
Form III (mufāʿalah) رَاقَبَ يُرَاقِبُ مُرَاقَبَةًrāqaba yurāqibu murāqabatan: to watch over; to keep a close eye on (this verb is not used in the Quran).
Form V (tafaʿʿul) تَرَقَّبَ يَتَرَقَّبُ تَرَقُّبًاtaraqqaba yataraqqabu taraqquban: to keep watch over oneself so as to avoid something, to be on one's guard. ﴿فَاَصْبَحَ فِي الْمَدِيْنَةِ خَآئِفًا يَّتَرَقَّبُ﴾ (Al-Qaṣaṣ 28:18)
Form VIII (iftiʿāl) اِرْتَقَبَ يَرْتَقِبُ اِرْتِقَابًاirtaqaba yartaqibu irtiqāban: to wait attentively, to await; اِرْتَقِبْirtaqib (imperative, amr): wait; مُرْتَقِبٌmurtaqib (active participle, ism fāʿil): one who waits. ﴿فَارْتَقِبْ اِنَّهُمْ مُّرْتَقِبُوْنَ﴾ (Ad-Dukhān 44:59)