get cold feet 临阵退缩；害怕；胆怯；临阵脱逃

【例句】
I had agreed to give a speech, but as the time approached, I began to get cold feet.
我已经答应进行一次演说，但随着时间的逼近，我开始胆怯了。

Some people always get cold feet when they go to a test.
有些人当他们去考试的时候，总是感到害怕。