to change from being a liquid or gas to a solid form, or to make something do this

Molten volcanic lava solidifies as it cools. 火山熔岩冷却后变成固体。

The chemical reaction solidifies the resin. 化学反应使树脂凝固变硬。

to become or make something become certain

He solidified his commitment to the treaty, giving a forceful speech in favour of it. 他发表了支持该条约的立场鲜明的讲话，进一步强调了他信守条约的承诺。

Support for the policy is solidifying. 对这项政策的支持日益巩固。