1 [I,T] to become or to make sth hard or less likely to change (使)变硬或强硬:
The concrete will harden in 24 hours.混凝土可于24小时内凝固。The firm has hardened its attitude on this question.公司对这个问题的态度变得强硬了。
2 [T] (usually passive 通常用于被动语态) harden sb (to sth/doing sth) to make sb less kind or less easily shocked 使心肠变硬;使见怪不怪:
a hardened reporter/criminal铁石心肠的记者/罪犯Police officers get hardened to seeing dead bodies.警察看见尸体已经习以为常了。
3 [I] (used about a person's face, voice, etc) to become serious and unfriendly (指人的脸色、说话声音等)变得严峻
harden/ˋhɑrdṇ; ˈhɑːdn/v [I,T] 1 to become firm or stiff, or to make something firm or stiff(使)变硬﹔(使)坚固﹔(使)硬化: It will take about 24 hours for the glue to harden. 胶水干透需要大约 24 小时。 2 if your attitude hardens, or if something hardens it, you become more strict and determined and less sympathetic(使)变得更坚定﹔(使)变得更强硬: Attitudes towards the terrorists have hardened even more since the attack. 那次袭击后﹐人们对恐怖分子的态度变得更强硬了。 —hardened adj [only before noun 仅用于名词前]a hardened criminal 惯犯