ركس1 رَكَسَهُ, (S, Msb,) aor. ـُ (Msb, TA,) inf. n. رَكْسٌ, (S, A, Msb, K,) He turned it over, or upside down; (S, A, Msb, K;) as also ↓ أَرْكَسَهُ: (S:) or the former, (TA,) or ↓ latter, (Msb,) he turned it over upon its head: (Msb, TA:) and the former, he reversed it; made the first part of it to be last; or turned it fore part behind. (Lth, A, Msb, K.) It is said in the Kur [iv. 90], بِمَا كَسَبُوا ↓ وَاللّٰهُ أَرْكَسَهُمْ Since God hath subverted them [for what they have done, or committed]; syn. تَكَّسَهُمْ: (IAar, K:) or hath made them return to their unbelief; (Fr, S, K;) and رَكَسَهُمْ signifies the same: (Fr, TA:) or hath separated, or dispersed, them, for what they have done of their disbelief, and acts of disobedience: (Jel:) رَكَسْتُ الشَّىْءَ and ↓ أَرْكَسْتُهُ both signify I separated the thing; or set it apart. (TA.) Yousay also, اللّٰهُ عَدُوَّكَ ↓ أَرْكَسَ May God overturn thine enemy upon his head: or change, or reverse, the state, or condition, of thine enemy. (A.) And فِى الشَّرِّ ↓ أَرْكَسَهُ He turned him back, or caused him to return, to evil. (A.) And ↓ أَرْكِسِ الثَّوْبَ فِى الصِّبْغِ Return thou the garment, or piece of cloth, to the dyeing-liquor. (A.) 4 أَرْكَسَ see 1, throughout.8 ارتكس He, or it, became turned over, upside down, or upon his, or its, head; became inverted, subverted, or reversed; became turned fore part behind: (K, TA:) he returned, reverted, or went back, from one thing or state to another: (TA:) he fell. (K.) You say, ارتكس فُلَانٌ فِى أَمْرٍ كَانَ قَدْ نَجَا مِنْهُ (S, A, TA) Such a one fell [again] into a case from which he had escaped. (TA.) رِكْسٌ i. q. رِجْسٌ [Uncleanness, dirt, or filth; or an unclean, a dirty, or a filthy, thing]: (S, A, Msb, K:) and anything that is disliked, or hated, for its uncleanness, dirtiness, or filthiness; (Msb;) as also ↓ رَكِيسٌ: (TA:) the former is similar in meaning to رَجِيعٌ [dung of a man, or of a horse and the like, or of a wild beast]; (A 'Obeyd, TA;) and ↓ رَكِيسٌ [also] is syn. with  رَجِيعٌ. (TA.) رَكِيسٌ: see مَرْكُوسٌ, throughout: A2:  see also رِكْسٌ, in two places.مَرْكُوسٌ A thing turned over, or upside down; turned over upon its head; turned fore part behind; as also ↓ رَكِيسٌ. (TA.) b2:  Turned, or sent, back, or away; as also ↓ the latter epithet. (TA.) b3:  One who goes back, or reverts, from his state or condition; like مَنْكُوسٌ: (IAar, TA:) and ↓ the latter epithet (ركيس), a weak person, who returns, or reverts, from one thing or state to another; syn. ضَعِيفٌ مُرْتَكِسٌ. (TA.)