hard·en/`hɑrdṇ; ˈhɑːdn/ v 1 [I,T] to become firm or stiff, or to make something firm or stiff （使）变硬; （使）坚固; （使）硬化: The pottery has to harden before it's painted. 陶瓷在彩绘之前必须烧硬。 2 [I,T] to become less kind, less afraid, and more determined, or to make someone become like this （使）变得冷酷; （使）强硬; （使）坚定: Ged's expression hardened when he saw her. 格德看到她表情就变冷酷了。