| 释义 |
clam upklAmv adv [I] infmlto go silent suddenly, or to refuse to speak about a particular subject沉默，拒不开口He used to clam up if you tried to ask him about his childhood.以前如果你试图问他的童年，他会拒不开口的。It is difficult to get proper information about the project, because everyone clams up as soon as you start asking questions.得到关于这个项目的正确消息很难，因为你一问问题每个人都会守口如瓶。
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