Comprehensive resource for understanding and mastering English idioms
The idiom "cold feet" refers to a feeling of nervousness, hesitation or fear that makes someone unwilling to proceed with something they had previously agreed to do. It is often used to describe someone who is having second thoughts or who is uncomfortable with the decision they have made. The figurative meaning of the idiom is that one's feet feel cold, which can be interpreted as a sign of unease or discomfort.
The origin of the idiom is not entirely clear, but there are several theories about its meaning. One theory suggests that it comes from the practice of placing one's feet in cold water before a wedding to make them numb and prevent any regrets. Another theory suggests that it comes from the medieval practice of asking for someone's "feet" when seeking consent or permission to do something. If they said no, it was like saying "cold feet". Another theory suggests that it comes from the old English phrase "cold foote" which meant "to be frightened or anxious".