غَسَا اللَّيْلُ

, (S, K,) aorist يَغْسُو, (S,) verbal noun غُسُوٌّ; (S, K; according to some copies of the K غَسْوٌ;) and غَسَى, aorist يَغْسِى; (IJ, TA;) and غَسِىَ, aorist يَغْسَى, (S, K, TA,) verbal noun غَسًا; of which last form, غَشِىَ is a dialect var.; (TA;) The night was, or became, dark; as also ↓ اغسى. (S, K.) [See also عَسَا.]