Cold can affect other parts of the body. The feet, for example. Heavy socks can warm your feet, if your feet are really cold. But there is an expression -- to get cold feet -- that has nothing to do with cold or your feet.
寒冷会影响人体的其它部位。例如，脚。如果你双脚冰冷，厚袜子可以暖脚。但to get cold feet这个短语和寒冷以及你的双脚没有任何关系。
The expression means being afraid to do something you had decided to do. For example, you agree to be president of an organization.
这个短语的意思是打退堂鼓。例如，你同意担任某个组织的总裁。
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