Have cool feet 或get cold feet对一个计划或一件事情紧张，甚至不想去做了。

他本来是要表白爱意的，可事到临头他却胆怯得什么也没有说。Hewas going to confess his love but he got cold feet and said nothing.

你还想跟这个生气的顾客对话吗，还是胆怯得不想说了？Areyou still ready to talk to this angry customer or are you having cold feet.