cold feet字面意思是：脚冷，真实含义意思是：胆怯；临阵退缩；退缩。

【例句】
He was going to ask her but he got cold feet and said nothing.
他本来是想向她提出邀请的，可事到临头他却胆怯得什么也没有说。

He planned to participate in the demonstration, but then he got cold feet.
他打算参加示威，但后来临阵退缩了。