Cool Your Heels

Etymology:

• This idiom became popular in the 16th century. It is based on a scientific fact of human body. When you walk or jog, your feet become warm. If you stand or sit for a long time-period, your feet become cold. So, this phenomenon was given the form of an expression. The long wait that makes you stand leaves a cooling effect on your shoes. This idiom is used in different contexts in the modern writings. If someone keeps you on wait for a long time, it is described as cooling ones heels.