cool one heels意思有很多,其中一个是：if someone leaves you to cool your heels,they force you to wait,often until you become calmer.中文就是：使……冷静.还有“空等”、“耐心等”等等的意思
如果是使……冷静的意思,近义词就可以是calm one down,比如
John wants to calm himself down.
John wants to cool his heels .都是约翰想让自己冷静下来 的意思