غسو ند غسى

1 غَسَا اللَّيْلُ ذ , (S, K,) aor. يَغْسُو, (S,) inf. n. غُسُوٌّ; (S, K; accord. to some copies of the K غَسْوٌ;) and غَسَى, aor. يَغْسِى; (IJ, TA;) and غَسِىَ, aor. يَغْسَى, (S, K, TA,) inf. n. غَسًا; of which last form, غَشِىَ is a dial. var.; (TA;) The night was, or became, dark; as also ↓ اغسى. (S, K.) [See also عَسَا.]