... Cool as a cat 处事不惊 *Cool your heels 好了，安静会儿吧 **Coon's age 很长时间 ...
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... click your heels：（敬礼或致敬时）脚跟咔嗒一并 come to heel：走近；紧跟；听从指令；服从管束 cool your heels：久等；空等 ...
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cool your heels
冷静一下
以上为机器翻译结果，长、整句建议使用 人工翻译 。
I am very sorry to have you cool your heels for so long.
不得不让你等了这么久，真抱歉。
youdao
When you are forced to sit in one place, your heels stay cool.
当你被迫坐在一个地方时，你的脚跟会保持凉爽。
Do not make your guests cool their heels when you have appointments with them.
同客人订了约会就不该让人家久等。
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