اِسْلَنْطَحَ
1.
It (a thing) was, or became, long and wide. (AA, O and L in this article: mentioned in the S in article سطح.)
2.
It (a valley) became wide: (K:) according to IF, both the ل and ن are added to give intensiveness to the signification. (O.)
3.
He (a man) extended himself or became extended [apparently on the ground]; synonym اِنْبَسَطَ: (L:) or he became thrown down upon his face: or he lay, or lay as though thrown down or extended: or he stretched himself; or lay, and stretched himself; upon his face, extended upon the ground: synonym اِنْطَبَحَ: (O:) or he lay as though thrown down or extended, upon the back of his neck: (Ibn-'Abbád, O:) or he (a man, L) fell upon his face: (L, K:) and upon his back. (L.)