ك أ س

كَأْسٌ , (ISk, S, A, Msb, K,) and كَاسٌ , with the ء suppressed, is allowable, (Msb,) and sometimes occurs, (TA,) A drinking-cup: (A, K:) or [a cup of wine; i. e.] a cup containing wine; (S, A, K;) or a cup full of wine: (Msb:) when not containing wine, it is not thus called; (IAar, S, Msb;) being in this case called قَدَحٌ : (TA:) or it has the first and the second of these significations: (TA:) or it signifies wine itself: (As, AHát, Ibn-'Abbád:) or has this signification also: (K:) and is of the fem. gender: (S, A, Msb, K:) pl. [of pauc.] أَكْوءُسٌ and [of mult.] كُوءُوسٌ and كِيءَاسٌ , (S, Msb, K,) the last with ء , (TA, [but written without ء in the CK,]) and, accord. to AHn, كِيَاسٌ , without ء , which, if correct, is originally كِوَاسٌ , from كَاسٌ , with the ء changed into ا as representing و , (TA,) and كَاسَاتٌ , (K,) without ء . (TA.) It is used metaphorically in relation to every kind of disagreeable, hateful, or evil, things. Thus you say, سَقَاهُ كَأْسًا مِنَ الذُّلِّ (tropical:) [He gave him to drink a cup of abasement]: and مِنَ الفُرْقَةِ (tropical:) [of separation]: and مِنَ المَوْتِ (tropical:) [of death]: and مِنَ الحُبِّ (tropical:) [of love]. (TA.) You say also, سَقَاهُ الكَأْسَ الأَمَرَّ (tropical:) [He gave him to drink the most bitter cup]; meaning death: (A, TA:) and كُوءُوسَ المَنَايَا (tropical:) [The cups of death; lit., deaths]. (A.) Az. thinks that it may be derived from كَاصَ فُلَانٌ مِنَ الطَّعَامِ وَالشَّرَابِ , meaning, “ Such a one ate and drank much ”; because ص and س are interchangeable in many words on account of the nearness of their places of utterance. (TA.)