As you know in English we love to use idioms, and one strange idiom that is used very often is "cold feet".
Obviously there are two meanings to the expression "cold feet", one meaning, is the literal meaning, which is to describe the fact that a person actually has cold feet.
"I have been standing in the snow in my sandals, I have really cold feet"
However this is not the idiomatic meaning, idiomatically when someone says they have "cold feet" they are using it to describe fear or strong doubt.
"I wanted to ride the roller coaster, but when I got to the line I got cold feet so I didn't ride it"
This means that speaker wanted to go on a roller coaster, but became afraid and didn't ride it.
Remember, don't get cold feet when speaking English, just ask your online English teacher to help you.
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