Güneşin ısısı kili sertleştirir.
- The heat of the sun hardens clay.
İsviçre göç politikasını sertleştirdi.
- Switzerland hardened its immigration policy.
The harsh fall weather steeled them against the colder winter.
When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go. — KJV, Exodus 4:21.