https://online2.tingclass.net/lesson/shi0529/0009/9907/886.mp3
https://image.tingclass.net/statics/js/2012
clam up 保持沉默,拒不開口 (非正式)
Why are you clamming up? Come on, talk.
你為什么不說(shuō)話了?說(shuō)吧。
I would like him to clam up for a while.
我希望他可以沉默一段時(shí)間。