freeze up phrasal verbphr v a) if a machine, engine, or pipe freezes up, the liquid inside becomes solid with cold so that it does not work properly 〔机器、引擎或管子〕冻住 SYN freeze
b) to suddenly be unable to speak or act normally 〔突然〕呆住 I wouldn’t know what to say. I’d just freeze up. 我不知道说什么好,整个人呆住了。
→ freeze up at freeze1(5)