شد — اشتدّ
$ad~a, aor شِدَّةٌ, (S, Msb,) whence the former verb; (S;) and ↓ t$Ad~; (L;) It was, or became, hard, (L, and MA and KL and PS in explanation of the first,) said of a substance and of an attribute: (L:) it, or he, was, or became, firm, compact, or sound; (L &c. as above;) strong, […]