نَعَسَ
1.
, (S, A, Msb, K,) aorist
نَعُسَ
, (S, M, and so in a copy of the B by the author of the K,) or
نَعَسَ
, (A, K,) [the latter being agreeable with analogy,] verbal noun نُعَاسٌ, (S, A, K, * TA,) or this is a simple subst., (Msb,) [He drowsed; he was, or became, drowsy, or heavy with sleepiness: or he slumbered, or dozed:] the verbal noun is synonym with
وَسَنٌ: (S, A, K:) or
نُعَاسٌ signifies languor in the senses, (K, TA,) arising from the heaviness [which is the prevenient sign] of sleep: (TA:) or the beginning of sleep: (M, article وسن:) or its proper signification is, according to Az, (Msb, TA,) وَسَنٌ (Msb) or سِنَةٌ (TA) without sleep: (Msb, TA,) or سِنَةٌ is in the head, and نُعَاسٌ is in the eye: or سنة is the vapour (ريح) of sleep which begins in the face, then is transmitted to the heart, and you say, of a man, يَنْعَسُ, and then, يَنَامُ. (Msb, article نوم.) It is said in a proverb,
مَطْلٌ كَنُعَاسِ الكَلْبِ [A delaying of the payment, of a debt, or the like, like the drowsing, or slumbering, of the dog:] i. e. continual: (S, TA:) for the dog is characterized by much نعاس, and, as is said in the B, is accustomed to open his eyes [only] sufficiently for the purpose of guarding, and this he does time after time. (TA.)
2.