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cool (one's) heels
To wait, sometimes so that one becomes calmer or more composed. You need to cool your heels for a minute and stop yelling at the staff—they didn't do anything wrong. We were excited, but we had to cool our heels when the release date for the new game got pushed back.
cool one's heels
Fig. to wait (for someone); to wait for something to happen. I spent an hour cooling my heels in the waiting room while the doctor saw other patients. All right, if you can't behave properly, just sit down here and cool your heels until I call you.
cool (one's) heelsInformal
To wait or be kept waiting.