sink, fail, flunk

, (S, M, A, &c.,) aor. , (M, A, &c.,) inf. n. رُسُوبٌ (S, M, A, Mgh, Msb, K) and رَسْبٌ; (Msb;) and رَسُبَ, aor. ; (M, A, K;) It (a thing, S, Msb) sank, or subsided, (S, M, A, Mgh, Msb, K,) in water [&c.]. (S, M, A, Mgh, K.) ― -b2- [Hence,] رَسَبَتْ عَيْنَاهُ (tropical:) His eyes sank [in their sockets]. (S, A.) ― -b3- And السَّيْفُ يَرْسُبُ فِى الضَّريبَةِ (tropical:) The sword sinks, or disappears, in the thing struck with it. (TA.)

It precipitated a substance, or caused it to sink in a liquid: used in this sense in chymical works; but probably post-classical. See what next follows.]

It caused [a thing] to sink: hence, in a trad., describing the people of Hell, إِذَا طَفَتْ بِهِمُ النَّارُ أَرْسَبَتْهُمُ الأَغْلَالُ When the fire shall raise them, and make them. to appear [or rather to swim upon its surface], the collars, by reason of their weight, shall make them to sink to the bottom thereof. (TA.) -A2- And ارسبوا Their eyes sank in their heads by reason of hunger. (K, TA.)

It (a substance) became precipitated, or was caused to sink, in a liquid: used in this sense in chymical works; but probably postclassical.]

and رُسَبٌ: see the next paragraph.

[What is wont to sink, or subside, in water &c. ― -b2- And hence,] Dregs amid water and blood: in this sense improperly pronounced رُسُوبٌ. (KL. [Golius, as on the same authority, explains it as meaning sedimentum aquæ, urinæ, etc.: hypostasis. See also the next paragraph.]) ― -b3- [Hence also,] (tropical:) A sword (S, M, A, K) that penetrates into, (S,) or that disappears in, (M, A, K,) the thing struck with it; (S, M, A, K;) and so ↓ رَسَبٌ (M, K) and ↓ رُسَبٌ (K, TA) and ↓ مِرْسَبٌ. (A, K, TA. [In the CK, by the omission of وَ after the last, this and the last but one are made to be appellations of a sword of Mohammad or of Soloman, and of a sword of El-Hárith Ibn-AbeeShemir.]) ― -b4- And (assumed tropical:) The glans of the penis: (M, K:) app. because of its disappearance on the occasion of the act of جِمَاعِ. (M.) ― -b5- And (assumed tropical:) Forbearing, or element; as also ↓ رَاسِبٌ. (K.)

(JK and Mgh and K in art. تقن [in CK erroneously رَسَابَة]) [The sediment of water;] the thick matter that is borne by water [and that sinks to the bottom]. (Lth, Mgh in that art.)

[ and ↓ مُتَرَسِّبٌ, terms used by Ibn-Seenà, are explained by Golius as meaning Having, or depositing, a sediment: but the former rather means having the nature of dregs, or sediment: and the latter, becoming, or that becomes, precipitated.]

(tropical:) A firm mountain. (M, A, K.) ― -b2- See also رُسُوبٌ.

A calamity, or misfortune; (K;) as also رَوْسَمٌ. (TA.)

: see رَسُوبٌ.

i. q. أَوَاسٍ [pl. of آسِيَةٌ, and app. here meaning Columns, or props]. (K.)